We successfully tested new warehouse bin creation in QA environment, but after transporting to production, we’re getting ‘Storage type not assigned to storage section’ errors. The warehouse structure looks identical between environments when I compare in LS10.
Error message:
Message: M7321
Storage type 012 not assigned to section A-01
Warehouse: WH01
Storage section: A-01
In QA, bins are created without issues using the same storage type and section combination. I’ve verified the transport included all warehouse customizing objects. What could cause this environment-specific behavior?
Check if the storage type assignment got overwritten during transport. Sometimes when you have existing production data, the transport doesn’t merge correctly. Use transaction OMJH to verify storage type assignments and compare with your QA system.
Look at the transport return code in STMS. Sometimes transports show green but have warnings that skip certain table entries. If T340D had active locks during import or if there were existing customizing requests not yet released, your assignment could have been skipped. Check transaction SE03 for any locked customizing objects in your warehouse number range.
This is a classic transport sequence issue. If you transported the warehouse structure before the storage type assignments, the system creates incomplete references. Run SE16 on table T340D in both systems and compare the entries for storage type 012 and section A-01. The production system probably has the section defined but missing the link to the storage type.
I checked T340D and you’re right - the storage type to section assignment is missing in production even though it exists in QA. The transport log shows it was included in the request. Could this be a lock or activation issue?
Your issue is definitely the missing storage type assignment in production, but the root cause is more nuanced than a simple transport failure. Here’s what happened and how to fix it:
Root Cause Analysis:
The error occurs because the transport successfully created the storage section (A-01) but failed to establish the storage type assignment (012 → A-01) due to one of three common scenarios in production environments:
Existing Production Data Conflict: If production already had a storage section A-01 with different storage type assignments, the transport logic may have preserved the existing production configuration instead of overwriting it with your QA settings.
Transport Sequence Dependency: The storage section structure (table T340C) and storage type assignments (table T340D) are in different customizing objects. If they were in separate transport requests or imported in wrong order, the link breaks.
Client Mismatch: In SAP S/4HANA 1909, storage section assignments are client-dependent while storage types are cross-client, causing environment-specific behavior.
Complete Resolution:
Step 1 - Verify Current State:
Run SE16N on table T340D with these filters:
LGNUM = WH01
LGTYP = 012
LGBER = A-01
If no entries exist in production but exist in QA, you have confirmed missing assignment.
Step 2 - Manual Configuration (Immediate Fix):
Go to SPRO → Logistics Execution → Warehouse Management → Master Data → Storage Section → Assign Storage Types to Storage Sections. Add the assignment manually:
Warehouse: WH01
Storage Section: A-01
Storage Type: 012
Step 3 - Root Cause Prevention:
Create a new transport request and include BOTH:
Table T340C (Storage Section definition)
Table T340D (Storage Type assignment)
Use transaction SE10 to manually add these table entries to ensure they transport together atomically.
Step 4 - Validation:
After manual fix, test bin creation in production. Then transport your corrected configuration back to QA and re-transport to production to ensure future changes don’t break the assignment again.
Why QA Worked But Production Failed:
Your QA environment likely had a clean slate when you configured the warehouse structure, so all assignments were created fresh without conflicts. Production had existing warehouse data that caused the transport to partially apply, creating the section but skipping the storage type assignment due to conflict resolution logic.
The manual configuration in Step 2 will immediately resolve your bin creation issue. The transport cleanup in Step 3 prevents recurrence during future changes.