How To Fix W_DSD_01024 - Some matl/store combs. already have main suppl. assignments in the future

SAP Error Message - Details

• Message type: E = Error

• Message class: W_DSD_01 - Global message class for DSD

• Message number: 024

• Message text: Some matl/store combs. already have main suppl. assignments in the future

What causes this issue?

At least one of the material/store combinations that you have selected
for main vendor assignment already has another main vendor assignment
for another vendor in the future.

System Response

You cannot select these vendors as main vendors, since there must be
only one main vendor for each material/store combination at a specific
time. Material/store combinations without future main vendor assignments
will receive the missing main vendor assignments.

How to fix this error?

If you want to mark the problematic vendors as main vendors for the
material/store combinations, you must first remove the future main
vendor assignments for the other vendors.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message W_DSD_01024 - Some matl/store combs. already have main suppl. assignments in the future ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W_DSD_01024: Some matl/store combs. already have main suppl. assignments in the future
  
  Meaning / Cause:
  This warning message occurs in SAP's Vendor Evaluation or Source Determination processes, particularly when you try to assign a main supplier to a material/store combination (matl/store) for a future validity period, but there is already an existing main supplier assignment for the same material/store combination that overlaps or exists in the future.
  In other words, the system detects that for the same material and plant/storage location, a main supplier is already assigned for a future date range, and you are attempting to create another main supplier assignment that conflicts with this.
  
  When does it occur?
  
  When maintaining or changing source lists (transaction ME01, ME02, or via mass maintenance tools).
  When assigning or changing main supplier assignments for materials in specific plants or storage locations.
  When validity periods of supplier assignments overlap or conflict.
  
  
  Cause Details:
  
  SAP requires that for each material and plant/storage location combination, there should be only one main supplier valid at any given time.
  If you try to assign a new main supplier for a future period that overlaps with an existing main supplier assignment, SAP issues this warning.
  This is to prevent ambiguity in source determination and procurement processes.
  
  
  Solution / How to Resolve:
  
  
  Check existing main supplier assignments:
  
  Use transaction ME01 (Maintain Source List) or ME02 (Change Source List) to review the current main supplier assignments for the material and plant/storage location.
  Look at the validity periods of existing assignments.
  
  
  
  Adjust validity periods:
  
  Modify the validity period of the existing main supplier assignment so that it does not overlap with the new assignment.
  Or, adjust the new assignment's validity period to start after the existing assignment ends.
  
  
  
  Remove or deactivate conflicting assignments:
  
  If the existing main supplier assignment is no longer valid or needed, delete or deactivate it before creating the new assignment.
  
  
  
  Check for multiple entries:
  
  Sometimes, duplicate entries or incorrect data maintenance cause this issue. Clean up any redundant or incorrect entries.
  
  
  
  Use transaction ME03 (Display Source List):
  
  To verify the source list entries and their validity periods.
  
  
  
  If intentional overlap is required:
  
  SAP does not allow two main suppliers for the same material/store at the same time. You may need to reconsider your procurement strategy or use alternative methods (e.g., multiple source assignments without main supplier flag).
  
  
  
  
  Additional Information:
  
  The message is a warning (W_), so it may allow you to proceed, but it is recommended to resolve the conflict to avoid procurement errors.
  Main supplier assignments are critical for automatic source determination during purchase order creation.
  Overlapping main supplier assignments can cause incorrect vendor proposals or procurement errors.
  This message is related to the Source List functionality in SAP MM (Materials Management).
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Message
  W_DSD_01024: Some matl/store combs. already have main suppl. assignments in the future
  
  
  Cause
  Overlapping main supplier assignments for the same material and plant/storage location.
  
  
  Solution
  Check and adjust validity periods of main supplier assignments in the source list.
  
  
  Transactions
  ME01 (Maintain Source List), ME02 (Change Source List), ME03 (Display Source List)
  
  
  Impact
  Prevents ambiguity in source determination and procurement processes.
  
  
  
  
  If you need help with specific transaction steps or reports to identify conflicting assignments, feel free to ask!