How To Fix W_DSD_01023 - This matl/store comb. already has a main suppl. assignment in the future

SAP Error Message - Details

• Message type: E = Error

• Message class: W_DSD_01 - Global message class for DSD

• Message number: 023

• Message text: This matl/store comb. already has a main suppl. assignment in the future

What causes this issue?

You have selected a main vendor for a material/store combination which
already has a main vendor assignment for another vendor in the future.

System Response

You cannot select this vendor as main vendor, since there must be only
one main vendor for each material/store combination at a specific time.

How to fix this error?

If you want to mark this vendor as main vendor for the material/store
combination, you must first remove the future main vendor assignment for
the other vendor.

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_01023 - This matl/store comb. already has a main suppl. assignment in the future ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W_DSD_01023: This matl/store comb. already has a main suppl. assignment in the future
  
  Meaning / Cause:
  This warning message occurs in SAP when you try to assign a main supplier to a material/store combination (material + plant or storage location) 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 prevents you from having two different main suppliers assigned to the same material and store combination for overlapping or future time periods. The "main supplier" is the primary vendor responsible for supplying the material to that plant or storage location.
  
  When does it occur?
  
  When maintaining source list entries (transaction ME01 or via material master purchasing view).
  When creating or changing info records or source lists with future validity dates.
  When assigning a main supplier for a material and plant/storage location combination that already has a main supplier assigned for a future date range.
  
  
  Cause Details:
  
  The source list or info record for the material/store combination already contains a main supplier assignment with a validity period that overlaps or is in the future.
  SAP enforces that only one main supplier can be assigned per material/store combination for any given time period.
  Attempting to create a new main supplier assignment with a validity period that conflicts with an existing one triggers this warning.
  
  
  Solution / How to fix:
  
  
  Check existing assignments:
  
  Use transaction ME03 (Display Source List) or ME01 (Maintain Source List) for the material and plant.
  Review the existing source list entries and their validity periods.
  Identify the current main supplier assignments and their validity dates.
  
  
  
  Adjust validity periods:
  
  If you want to assign a new main supplier starting from a certain date, ensure that the existing main supplier's validity ends before the new assignment begins.
  Modify the validity period of the existing main supplier assignment to end before the new assignment starts.
  Alternatively, adjust the new assignment's validity period so it does not overlap.
  
  
  
  Delete or change existing entries if necessary:
  
  If the existing main supplier assignment is no longer valid or should be replaced, delete or change it accordingly.
  Then create the new main supplier assignment with the desired validity period.
  
  
  
  Check for info records:
  
  Sometimes info records (transaction ME12 or ME13) also influence supplier assignments.
  Verify if info records exist with conflicting validity periods.
  
  
  
  Use consistent data maintenance:
  
  Always maintain source lists and info records carefully to avoid overlapping validity periods for main suppliers.
  
  
  
  
  Additional Information:
  
  The main supplier is important for procurement processes, as it determines the preferred vendor for automatic source determination.
  Overlapping main supplier assignments can cause confusion in procurement and automatic purchase order creation.
  This message is a warning (W_), so it may allow you to proceed, but it is recommended to resolve the conflict to avoid procurement issues.
  If you want to assign multiple suppliers, only one can be marked as the main supplier for a given period; others can be secondary suppliers.
  
  
  Summary:
  
  
  
  Aspect
  Description
  
  
  
  
  Error message
  W_DSD_01023: This matl/store comb. already has a main suppl. assignment in the future
  
  
  Cause
  Overlapping or conflicting main supplier assignments for the same material/store combination
  
  
  Solution
  Adjust validity periods of existing assignments or delete conflicting entries before creating new ones
  
  
  Transactions
  ME01 (Maintain Source List), ME03 (Display Source List), ME12/ME13 (Info Records)
  
  
  
  
  If you need help with specific transaction steps or reports to identify conflicting assignments, feel free to ask!