Not a coder — the view of someone who runs the system. Field notes on building and operating SAP PP and PI.https://rabbitlogs.com/en-ushttps://rabbitlogs.com/en/blog/sap-project-decision-log/https://rabbitlogs.com/en/blog/sap-project-decision-log/Why SAP implementation meeting minutes pile up while the reasons behind decisions disappear, and what business-side leads should actually be writing down.Thu, 06 Aug 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-production-order-teco/https://rabbitlogs.com/en/blog/sap-production-order-teco/When to trigger TECO on a production order, and what gets cleared versus what stays behind when you close it out with quantity still remaining.Tue, 28 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-mrp-no-planned-order/https://rabbitlogs.com/en/blog/sap-mrp-no-planned-order/Five reasons MRP can run without generating a single planned order, walked through in the order you should check them.Thu, 23 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-junior-first-semester/https://rabbitlogs.com/en/blog/stats-junior-first-semester/A recap of my first semester as a junior transfer student at the Korea National Open University — from assignment formats to how finals actually worked, and what I learned by fumbling through itThu, 16 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-now-ai-tour-korea-2026/https://rabbitlogs.com/en/blog/sap-now-ai-tour-korea-2026/A firsthand account of the SAP NOW AI Tour Korea keynote in July 2026 — the autonomous enterprise strategy, its prerequisites, and the temperature of the room, confirmed through Hyundai Autoever's cost-analysis case study.Tue, 14 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-excel-powerquery-pivot/https://rabbitlogs.com/en/blog/stats-excel-powerquery-pivot/Why SAP exports don't behave in Excel out of the box, and the practical workflow of cleaning them up with Power Query and analyzing them with pivot tables.Fri, 10 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-sap-inventory-variance/https://rabbitlogs.com/en/blog/stats-sap-inventory-variance/When SAP inventory and physical count don't match, here's how to read the variance statistically and track down the cause in practice.Tue, 07 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-correlation-vs-causation/https://rabbitlogs.com/en/blog/stats-correlation-vs-causation/From the meaning of the correlation coefficient r to the difference between correlation and causation and common mistakes made in practice — a statistics concept note.Sat, 04 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-mean-trap-kpi/https://rabbitlogs.com/en/blog/stats-mean-trap-kpi/A look at the distortion that creeps in when a KPI is managed by a single mean value, through real cases of quote lead time and on-time delivery rate, and how to read data properly.Wed, 01 Jul 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-descriptive-basics/https://rabbitlogs.com/en/blog/stats-descriptive-basics/From mean, median, and variance to standard deviation and quartiles — the core concepts of descriptive statistics, explained for beginners with practical context.Sun, 28 Jun 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-adsp/https://rabbitlogs.com/en/blog/stats-adsp/I took the ADsP exam to learn to read SAP data with evidence instead of gut feeling. A round-47 passer shares a 2-week study plan for working adults, plus AI-generated mock exams.Thu, 25 Jun 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/stats-why-back-to-school/https://rabbitlogs.com/en/blog/stats-why-back-to-school/Why a production management practitioner working with SAP and MES transferred into a statistics and data science program at the Korea National Open University. A plain account of wanting to speak about production metrics in data instead of gut feeling.Mon, 22 Jun 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-field-names/https://rabbitlogs.com/en/blog/sap-field-names/Why SAP field names like AUFNR and MATNR look like alien code, and an easy way to decode them — explained through the ingredient names on a kitchen recipe card.Thu, 18 Jun 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-data-types/https://rabbitlogs.com/en/blog/sap-data-types/Most SAP errors trace back to one of three places: configuration, master data, or transaction data. Explains the three data types using the analogy of house operating rules, an ingredient reference sheet, and order records.Thu, 21 May 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-cpim/https://rabbitlogs.com/en/blog/sap-cpim/A working PP consultant explains why they recommend CPIM before SAP certification — the difference between the 'How' of running a system and the 'Why' of understanding the process, from a practitioner's perspective.Mon, 04 May 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-exam-format/https://rabbitlogs.com/en/blog/sap-exam-format/SAP certification exams have shifted from multiple choice to hands-on. Covers the difference between the system-based exam and the AI scenario exam, the registration process, and mistakes you need to know about.Fri, 17 Apr 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-certification/https://rabbitlogs.com/en/blog/sap-certification/Covers SAP certification eligibility, training costs, Stay Certified renewal fees, and whether you actually need one, from a beginner's perspective.Fri, 10 Apr 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-production-order-carryover/https://rabbitlogs.com/en/blog/sap-production-order-carryover/Two ways to carry an incomplete SAP production order into the next month — order carryover and WIP cost carryover — compared through the analogy of closing out a large restaurant catering order.Mon, 30 Mar 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-circular-bom/https://rabbitlogs.com/en/blog/sap-circular-bom/Explains what an SAP circular BOM is, why rework situations need one, and how to set it up, using a simple broth analogy.Thu, 12 Mar 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-production-order-number/https://rabbitlogs.com/en/blog/sap-production-order-number/Why SAP production order numbers are never reused, why they're unique at the client level, and what happens when a number range runs out, explained through the analogy of a bank's ticket-number dispenser.Thu, 05 Mar 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-wip/https://rabbitlogs.com/en/blog/sap-wip/Why work-in-progress (WIP) matters from a production, cost, and inventory perspective, explained through the lens of a dish still cooking, from the vantage point of three different experts.Thu, 26 Feb 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-gi-gr-cnf/https://rabbitlogs.com/en/blog/sap-gi-gr-cnf/Explains GI (goods issue), GR (goods receipt), and CNF (production confirmation) — three terms you run into daily in SAP — using the analogy of ingredient flow in a restaurant.Thu, 19 Feb 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-production-order-status/https://rabbitlogs.com/en/blog/sap-production-order-status/SAP production order status codes like CRTD, REL, CNF, DLV, and TECO, explained through the order in which a dish comes together in the kitchen.Thu, 12 Feb 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-planned-vs-production-order/https://rabbitlogs.com/en/blog/sap-planned-vs-production-order/How does a planned order created by MRP turn into a confirmed production order? The key difference between the two, explained through how a restaurant prepares and finalizes a large group order.Thu, 05 Feb 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-movement-type/https://rabbitlogs.com/en/blog/sap-movement-type/What SAP movement types are, and why codes like 261, 101, and 311 matter in the PP production process — explained through the flow of ingredients in a restaurant kitchen.Thu, 29 Jan 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-mrp/https://rabbitlogs.com/en/blog/sap-mrp/MRP is the core brain of SAP PP. This post explains how it automatically calculates what's needed, how much, and when, through the lens of a restaurant preparing for a large group reservation.Thu, 22 Jan 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-pp-master-data/https://rabbitlogs.com/en/blog/sap-pp-master-data/The four pillars of master data that SAP PP is built on — material master, BOM, routing, and production version — explained at a beginner's level through the lens of running a restaurant menu.Thu, 15 Jan 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-joule-clean-core/https://rabbitlogs.com/en/blog/sap-joule-clean-core/Using SAP's AI assistant Joule assumes Clean Core, and getting to Clean Core means cleaning up accumulated Z-code first. Notes from SAP NOW AI Tour 2025 Korea on the real order of AI adoption, from a practitioner's view.Sun, 11 Jan 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-cbo-z-program/https://rabbitlogs.com/en/blog/sap-cbo-z-program/CBO (Z-code) is what a company builds when standard SAP functionality can't cover its work. Covers what it is, its pros and cons, and the real-world dilemma against standard T-codes.Sun, 04 Jan 2026 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-user-parameters/https://rabbitlogs.com/en/blog/sap-user-parameters/A step-by-step guide to using SAP parameter IDs to save frequently entered values, like plant or person-responsible codes, as defaults.Sun, 28 Dec 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-password-asterisk/https://rabbitlogs.com/en/blog/sap-password-asterisk/Why the password field on the SAP GUI login screen sometimes starts pre-filled with asterisks, how it triggers account lockouts, and how to turn the setting off.Sun, 21 Dec 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-change-management/https://rabbitlogs.com/en/blog/sap-change-management/Explains why work actually gets harder early in an SAP rollout, what the change resistance curve is, and three change management strategies, using a restaurant operations transition analogy.Wed, 17 Dec 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-dropdown/https://rabbitlogs.com/en/blog/sap-dropdown/How to set SAP dropdown lists to show both code (key) and text together, and why you should turn this on.Sat, 13 Dec 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-autocomplete/https://rabbitlogs.com/en/blog/sap-autocomplete/A step-by-step guide to deleting individual entries, clearing all history, and turning off SAP's input history (autocomplete) feature.Fri, 05 Dec 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-pp-tcode/https://rabbitlogs.com/en/blog/sap-pp-tcode/A reference of the T-codes used most often in SAP PP production management, organized by order-production-material-shipment flow. Focused on the display and change codes actually used day to day.Sat, 29 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-font-readability/https://rabbitlogs.com/en/blog/sap-font-readability/How to fix SAP's default font readability problems using D2Coding and Pretendard fonts. Covers everything from download to applying them in SAP GUI, step by step.Sat, 22 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-signature-theme/https://rabbitlogs.com/en/blog/sap-signature-theme/Among the many SAP themes available, here's why experienced practitioners pick the Signature Theme, and how to set it up, from a collaboration and productivity angle.Sat, 15 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-cutover-live/https://rabbitlogs.com/en/blog/sap-cutover-live/What actually happens during an SAP cutover — rollback decisions, data mismatches, and the PP module checklist — recorded from the perspective of someone who lived through it.Wed, 12 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-tcode-basics/https://rabbitlogs.com/en/blog/sap-tcode-basics/The concept of SAP T-codes (transaction codes), where to enter them, the /n and /o shortcut commands, and how to set up favorites — covered from a beginner's perspective.Mon, 10 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-cutover/https://rabbitlogs.com/en/blog/sap-cutover/Explains what an SAP cutover is, why it's the most tense moment in a project, and what you need to prepare for a successful cutover, using the analogy of a restaurant relocating to a new building.Wed, 05 Nov 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/study-pp-work-center/https://rabbitlogs.com/en/blog/study-pp-work-center/What a work center is as SAP PP master data, and why capacity, cost center, and person-in-charge information matter.Wed, 22 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-uat/https://rabbitlogs.com/en/blog/sap-uat/UAT is where real business users verify the system using their own actual work scenarios and formally approve it for go-live — explained through the owner's final walk-through before a restaurant opens.Thu, 16 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/study-pp-routing/https://rabbitlogs.com/en/blog/study-pp-routing/What routing is as SAP PP master data, and why operation numbers, work centers, and standard times matter, explained through a restaurant analogy.Wed, 15 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-integration-test/https://rabbitlogs.com/en/blog/sap-integration-test/Integration testing gathers modules that already passed unit testing and verifies they connect seamlessly along the real business flow, start to finish — explained through how a kitchen and dining floor link up.Wed, 08 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-batch-management/https://rabbitlogs.com/en/blog/sap-batch-management/Explains what an SAP batch is, how it differs from an MES lot, and why it matters for traceability, regulatory compliance, and inventory differentiation, using a restaurant ingredient-tracking analogy.Mon, 06 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-unit-test/https://rabbitlogs.com/en/blog/sap-unit-test/Unit testing is where a developer verifies that the smallest piece of functionality they built works correctly on its own — explained through the process of inspecting each ingredient brought into a restaurant.Wed, 01 Oct 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-prototype-test/https://rabbitlogs.com/en/blog/sap-prototype-test/Prototype testing builds a working sample of screens and functions before full-scale development so users can try it out early — explained through the process of touring a trial store before a restaurant is actually built.Wed, 24 Sep 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-batch-job/https://rabbitlogs.com/en/blog/sap-batch-job/Explains what an SAP batch job is, how to set it up and monitor it with T-codes SM36 and SM37, and how business users, PI, and developers collaborate on it in practice.Thu, 18 Sep 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-fit-gap/https://rabbitlogs.com/en/blog/sap-fit-gap/Fit/Gap analysis identifies how well SAP's standard functionality matches your company (Fit) and what needs adjustment (Gap), explained through the process of adapting a corporate standard menu to your own restaurant.Wed, 17 Sep 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-test-overview/https://rabbitlogs.com/en/blog/sap-test-overview/From Fit/Gap and prototype testing through unit, integration, and UAT, here's the full picture of SAP's five testing stages, mapped against the process of opening a new restaurant.Wed, 10 Sep 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-production-strategy/https://rabbitlogs.com/en/blog/sap-production-strategy/The difference between MTS (make-to-stock) and MTO (make-to-order) — the core of SAP production strategy codes — explained through the buffet and steakhouse analogy, along with how each strategy affects lead time and inventory management.Sun, 31 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-best-practice/https://rabbitlogs.com/en/blog/sap-best-practice/Explains what SAP Best Practice is, why SAP builds start from standard processes, and why following the standard 100% is a mistake — using a meal-kit analogy.Wed, 27 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-build-project-difficulty/https://rabbitlogs.com/en/blog/sap-build-project-difficulty/The real reason SAP implementation projects are hard isn't technology — it's people and communication. Mapped against the process of opening a new restaurant, here are the five stages from kickoff to stabilization.Wed, 20 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-activity-cnf/https://rabbitlogs.com/en/blog/sap-activity-cnf/Explains SAP PP's Activity and CNF/PCNF concepts through the flow of reporting kitchen results in a restaurant. Understand how execution results from MES get confirmed in SAP.Tue, 19 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-pi-overview/https://rabbitlogs.com/en/blog/sap-pi-overview/What SAP PI (Process Innovation) is, and why operations need to change before a new system goes in, explained through the analogy of a restaurant renovation.Wed, 13 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-pi-vs-implementation/https://rabbitlogs.com/en/blog/sap-pi-vs-implementation/Under the same label of 'SAP consultant,' PI (planning) and implementation (building) are completely different roles. Mapped against the process of opening a new restaurant, here's how the two worlds differ and how they balance each other.Wed, 06 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-pp-overview/https://rabbitlogs.com/en/blog/sap-pp-overview/What SAP PP (Production Planning) is, and how the flow from BOM and routing through MRP to production orders works, explained through a restaurant analogy.Tue, 05 Aug 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-mes-interface/https://rabbitlogs.com/en/blog/sap-mes-interface/The interface is the channel SAP and MES use to exchange data. This post breaks down the structural difference between RFC and PI/PO, and how to choose between synchronous and asynchronous, from a hands-on practitioner's view.Wed, 30 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-mes-role/https://rabbitlogs.com/en/blog/sap-mes-role/SAP is the head chef planning production, MES is the kitchen team executing it. When the two systems split roles and mesh together, that's the foundation of a smart factory.Wed, 23 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-now-ai-tour-2025/https://rabbitlogs.com/en/blog/sap-now-ai-tour-2025/A firsthand account of SAP NOW AI Tour 2025 Korea in July 2025 — from the keynote to the case-study sessions, in front of a crowd of 2,500, down to the one question a practitioner walked away with.Thu, 17 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-history/https://rabbitlogs.com/en/blog/sap-history/Five engineers left IBM in 1972 and founded SAP. From R/2 and R/3 to S/4HANA, here's how SAP became the standard for ERP, explained for beginners.Wed, 16 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-modules-guide/https://rabbitlogs.com/en/blog/sap-modules-guide/SAP's core modules (FI, CO, SD, MM, PP, QM, PM, PS, HR, LE) mapped to the different stations in a restaurant — floor, storeroom, kitchen, register, and more — explained for beginners.Wed, 09 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-org-structure/https://rabbitlogs.com/en/blog/sap-org-structure/What SAP's organizational structure (client, company code, plant, storage location) and core master data (material master, BOM, work center, routing) actually are, explained through the analogy of opening a restaurant.Thu, 03 Jul 2025 00:00:00 GMThttps://rabbitlogs.com/en/blog/sap-what-is-sap/https://rabbitlogs.com/en/blog/sap-what-is-sap/For anyone puzzled about what SAP actually is, this post breaks down the system that ties a whole company together, using the analogy of running a restaurant.Wed, 02 Jul 2025 00:00:00 GMT