# SAP MM Errors and Solutions: The Common Ones, by Process Step > Source: https://netray.co/erp-help/sap-mm-errors-and-solutions > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: ERP Help ## Short answer Most SAP MM errors fall in five places: purchasing document creation and release (ME21N), goods movements (MIGO), period control, invoice verification (MIRO) and account determination. This page lists the ones that come up most, what causes each, and the first fix, with links to detailed pages for the biggest ones. ## Kind error ## System sap ## Erp SAP ECC / S/4HANA ## Module MM / Purchasing, Inventory and Invoice Verification ## Query sap mm errors and solutions ## Alternate Queries - sap mm errors and solutions pdf - sap mm issues and solutions - common sap mm problems and fixes - sap mm troubleshooting guide ## Applies To SAP ECC 6.0 and S/4HANA on-premise MM-PUR, MM-IM and MM-IV. ## Steps ### How to troubleshoot any SAP MM error **Items:** - Read the full message, including the long text (double click the message or press F1 on it). The message class and number (for example M7 021) tell you the area. - Note the transaction, plant, material, movement type and posting date you used. Most MM errors depend on one of these. - Check stock or document status: MMBE for stock, MB52 for stock by storage location, ME23N for the PO, MB03 for a material document. - Check the period and company code settings (MMPV, OB52) if the message mentions posting date or period. - If the message is about accounts, look at automatic account determination in OBYC and the valuation class on the material. - If it is a block, find who or what set it: release status, invoice block reason, delivery block or a material status. - Fix the master data or configuration cause, not just the single document, or the same error returns tomorrow. ## Sections ### Goods movement errors (MIGO) **Body:** M7 021 'deficit of stock' means a goods issue would take stock negative for the material, plant, storage location or batch you chose. Check stock in MB52 for the exact level, the batch and special stock. Our detailed page covers it: sap-m7-021-deficit-of-stock-error. M7 053 'posting only possible in periods X and Y' means the posting date falls outside the open MM periods. Open the period with MMPV or change the posting date. See sap-migo-m7-053-posting-only-possible-in-periods and the period closing page. Another very common class is 'material not maintained in plant' or 'storage location not maintained': the material master lacks the plant or storage view. Extend it with MM01 or MM02 (create the missing views) and try again. ### Purchasing document errors (ME21N, ME28, ME29N) **Body:** A PO that cannot be ordered or printed often sits in a release strategy. Check the Release strategy tab in ME23N. If the strategy was not determined at all, see sap-me21n-release-strategy-not-determined-po-not-blocked; if the strategy exists but nobody can release it, see release-strategy-in-sap-mm-not-working. Pricing errors such as no price found show up as a net price of zero or a missing condition. Create the info record (ME11) or a condition record (MEK1) for the vendor, material and purchasing organization, then reprice the PO item. Account assignment errors (cost center locked, asset not found, WBS closed) are raised from FI/CO and need to be fixed in the master data of that account object, not in the PO. ### Invoice verification and account determination (MIRO, OBYC) **Body:** An invoice posted with a price or quantity variance can be blocked for payment. Use MRBR to release it after review. Details: sap-miro-invoice-blocked-price-variance-mrbr-release. If the GR/IR account fills up with unmatched amounts, use MR11 and MB5S: sap-miro-grir-clearing-account-mr11-mb5s-how-to. 'Account not determined' errors on any posting come from OBYC (automatic postings for BSX, WRX, GBB, PRD and other keys). The key is built from the chart of accounts, valuation grouping, valuation class and movement type. Compare the material's valuation class (MM03 Accounting 1) to the OBYC entry, and add the missing combination with the finance team. Posting period closed in FI instead of MM is a separate case: see sap-f5-posting-period-closed-error. ## Pitfalls - Fixing one document instead of the master data or configuration, so the same error returns. - Changing OBYC in production without finance sign off; the change affects every posting for that key. - Opening MM periods without checking that finance expects postings in the old period. - Releasing blocked invoices without checking the price variance cause. - Searching only for the message text instead of the message class and number, which stay constant across languages and releases. ## Ai Angle Triage is where time disappears: a user posts a goods issue, gets a message, and a key user has to find the stock, period and account facts. An assistant grounded in SAP data (ERPray, read-only, role-aware, can run on-prem) can pull stock by plant and storage location, open periods, the PO release status and the valuation class from the actual tables and show the query. Changes in OBYC, MMPV or release strategies stay with your team. ## Faq ### What are the most common SAP MM errors? **Answer:** Deficit of stock on goods issue (M7 021), posting period not open (M7 053), release strategy problems in purchasing, material not maintained in plant, invoice blocked for price or quantity variance and account determination missing in OBYC. ### How do I find the long text of an SAP error message? **Answer:** Double click the message in the status bar or open the message log and press F1. You can also look the message up in SE91 by class and number to read its text and where it is used. ### Where can I download an SAP MM errors PDF? **Answer:** SAP does not publish one official list. The reliable source is SE91, which shows every message and its long text for your release. Community blogs help, but check the text on your system. ### Why does SAP show an error for a posting that worked yesterday? **Answer:** Usually the period moved, stock changed, a block or release status changed, or a master data setting was edited. Compare yesterday's document to today's data before assuming a system fault. ## Search terms sap mm errors and solutions, sap mm errors and solutions pdf, sap mm issues and solutions, sap mm common errors, sap migo errors, sap me21n errors, sap miro errors, sap mm troubleshooting, sap obyc account not determined, sap material not maintained in plant --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json