M_MATE_WRK — Material Master Plant Authorization
M_MATE_WRK controls create, change, and display access to plant-specific material master views (MRP, purchasing, storage, work scheduling) for a given plant and activity. It works in tandem with M_MATE_MAT, which checks material type at client level. A user can pass one and fail the other, which is the most common source of confusion when extending a material to a new plant.
This page covers M_MATE_WRK, the authorization object that restricts plant-level material master maintenance by plant code and activity. It explains how the object interacts with M_MATE_MAT, where the check fires during material creation, extension, and mass maintenance, and how to isolate a failure using SU53 and the authorization trace.
Published 16 Sept 2026· 875 words
What it protects
M_MATE_WRK guards create, change, and display of plant-specific material master data: MRP views, purchasing view, storage view, work scheduling view, and similar plant-dependent screens in MM01, MM02, MM03, and mass maintenance. The structural fact that drives most tickets is that this object never acts alone. Every material master transaction also checks M_MATE_MAT, which authorizes by material type and activity without reference to plant. A role can be fully correct on material type and still block the user, because the specific plant value is missing from M_MATE_WRK, or vice versa. Extension of an existing material to a new plant is the classic failure case: the material already exists, so the user assumes 'change' is enough, but SAP treats the plant extension as a create activity against a plant the user has never touched before.
Fields checked
The object carries two fields.
- ACTVT - the activity being performed: 01 create, 02 change, 03 display are the values that matter in practice; a role scoped to display only will block every extension or update attempt even if the plant value is correct.
- WERKS - the plant against which the material view is being maintained; this is almost always the field missing a value when a new plant is rolled out and existing roles are not updated to include it.
Where it is checked
The check fires at the point where a plant-specific view is opened for save or display, not at transaction entry.
- MM01 - creation of a new material, and extension of an existing material to an additional plant; the check happens when the plant is entered and a plant-level view is selected.
- MM02 / MM06 - change and flag-for-deletion; fires when a plant view is opened for edit.
- MM03 - display; fires with ACTVT 03 when a plant view is opened.
- MM17 mass maintenance and MMSC storage location extension - fire the check per plant touched in the mass run, so a single mass job can fail on some plants and succeed on others.
- Material creation via BAPI or IDoc (interfaces used by migration tools and integration middleware) - the same check applies, so batch loads fail silently in the log rather than showing a screen message.
How to trace a failed check
Reproduce the failure and run SU53 immediately afterward, before any other transaction is executed, since SU53 only shows the last failed check for that user session. Confirm the object shown is M_MATE_WRK and read off the WERKS and ACTVT values the transaction requested against what the user's role actually carries. If SU53 is blank, empty, or shows an unrelated object, switch to the authorization trace (ST01 or the newer trace transaction) filtered to the user id, reproduce the exact same step, and pull the full list of objects checked in sequence, since M_MATE_MAT is frequently the one that actually failed while M_MATE_WRK passed. Hand the security team the user id, the transaction or BAPI used, the plant code, the requested activity, and the material number used to reproduce, so they can check both M_MATE_WRK and M_MATE_MAT together rather than fixing one and leaving the other broken.
Whose problem this is
This is a security team change once the functional side has identified the exact plant and activity required; the functional consultant's job is to state precisely which plant, which activity (create versus change versus display), and which transaction or interface triggered the failure, plus the material number used for reproduction, so the fix can be verified against the same scenario rather than guessed at.
Common pitfalls
Several patterns recur.
- A role is correct on material type via M_MATE_MAT but the plant value list on M_MATE_WRK was never updated when a new plant went live, so the fix is a one-line addition to an existing role, not a rebuild.
- Extending an existing material to a new plant requires create activity (01), not change (02); a role that only grants change access lets users edit plant data they already have but blocks them from adding the material to a plant they have never touched.
- In derived role setups the plant value often lives only in the derived role via the organizational level field, while the master role carries a dummy value; checking the master role wastes time and shows nothing wrong.
- Both M_MATE_MAT and M_MATE_WRK must pass for the same transaction step; fixing one and re-testing without checking the trace for the other leads to a second round trip when the next check blocks the same user.
- A failed check on a plant view is sometimes wrongly read as a data issue (missing plant extension in the material master) when it is purely an authorization gap, sending the ticket to the wrong queue.
Related SAP objects
Reviewed pages this object connects to in the ERPClimb knowledge graph.
Source: ERPClimb — https://erpclimb.com/sap-auth-objects/m-mate-wrkERPClimb is an independent platform and is not affiliated with SAP SE. Reference pages are written and reviewed by SAP consultants for learning and troubleshooting.