ME01 — Maintain Source List

create and maintain source-list entries that define valid sources of supply for a material and plant over a validity period. Treat ME01 as one step in an end-to-end process. Values shown or posted here are usually driven by master data, organization, dates and preceding documents, so an accurate diagnosis starts by preserving those inputs rather than changing the symptom screen first.

ME01 is typically used when purchasing or MRP source determination must control which vendor, contract or scheduling agreement is allowed or fixed. It is also valuable in project and regression testing because it provides a repeatable business state. In production, use the narrowest document or organizational selection that answers the question and capture the before-state before any posting, clearing or configuration change.

These are the fields and business objects that most often explain the result in ME01. Record them in support evidence so the next person can reproduce the same outcome.

Use document flow and chronology. Start from the source business event, inspect the ME01 document or master data, then follow the resulting accounting, purchasing or asset document and reconcile amount, quantity, account assignment and status. A correct proof uses the same company code or plant, business date, document keys and currency/unit context at every step.

Source lists remain supported in S/4HANA procurement; SAP documentation references ME03 for display and source-list use in purchasing/MRP. Where S/4HANA offers a Fiori successor or a changed data model, the classic transaction can still be valuable for support, but the strategic process and clean-core guidance should govern new implementations.

Primary ownership is the MM/P2P team, with adjacent teams involved when the evidence crosses into Asset Accounting, Project System, tax, Basis, Security or integration. Escalate with document numbers, organization, dates, expected result, actual result and checks already completed.

Use ERPClimb's related SAP objects to move upstream to the source/master data and downstream to posting, clearing, goods movement or reconciliation. That process view is more useful than memorizing ME01 alone because most production issues are created before they become visible here.