How To Fix MW181 - Supply sources could not be determined for all plants selected

SAP Error Message - Details

• Message type: E = Error

• Message class: MW - Messages IS-R / Allocation Tables

• Message number: 181

• Message text: Supply sources could not be determined for all plants selected

What causes this issue?

Master data for materials planning or purchasing might possibly be
missing for the specified material or plant.

How to fix this error?

You can enter the missing sources of supply in the plant detail
views or carry out a manual source of supply determination for
external vendors in the plant detail view.
If data that is necessary for automatically determining the source
of supply is missing, maintain this in master data maintenance.

Error message extract from SAP system. Copyright SAP SE.

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• What is the cause and solution for SAP error message MW181 - Supply sources could not be determined for all plants selected ?

  The SAP error message MW181 ("Supply sources could not be determined for all plants selected") typically occurs during the planning or procurement processes when the system is unable to find valid supply sources for the materials in the selected plants. This can happen for various reasons, and understanding the cause is essential for resolving the issue.
  Causes:
  
  
  Missing or Incorrect Master Data:
  
  The material master data may not be set up correctly. This includes missing purchasing info records, source lists, or material master records.
  The material may not be assigned to the relevant plants.
  
  
  
  No Valid Source of Supply:
  
  There may be no valid vendor assigned for the material in the purchasing info record.
  The source list may not contain any valid sources for the material in the selected plants.
  
  
  
  Plant-Specific Settings:
  
  The material may not be available for the specific plants due to plant-specific settings or restrictions.
  The material may be marked as "not relevant for planning" in the material master.
  
  
  
  Procurement Type:
  
  The procurement type for the material may not be set correctly (e.g., in-house production vs. external procurement).
  
  
  
  Stock Availability:
  
  There may be stock issues, such as stock being blocked or reserved for other purposes.
  
  
  
  Solutions:
  
  
  Check Material Master Data:
  
  Verify that the material master data is complete and correct for each plant. Ensure that the material is set up for the relevant plants and that the procurement type is appropriate.
  
  
  
  Review Purchasing Info Records:
  
  Check if there are valid purchasing info records for the material and vendor combination. If not, create or update the purchasing info records.
  
  
  
  Source List Maintenance:
  
  Ensure that the source list is maintained for the material and includes valid sources for the selected plants.
  
  
  
  Check Plant-Specific Settings:
  
  Review any plant-specific settings that may restrict the availability of the material for planning or procurement.
  
  
  
  Run MRP (Material Requirements Planning):
  
  If applicable, run MRP to see if it can determine the supply sources based on the updated data.
  
  
  
  Consult with Procurement Team:
  
  If the issue persists, consult with the procurement team to ensure that the necessary vendor agreements and contracts are in place.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  Use transaction codes like MM03 (Display Material), ME11 (Create Purchasing Info Record), and ME01 (Maintain Source List) to check and maintain the relevant data.
  
  
  
  MRP Configuration:
  
  Review MRP settings in the configuration to ensure that the system is set up correctly to determine supply sources.
  
  
  
  SAP Notes:
  
  Check SAP Notes for any known issues or patches related to this error message.
  
  
  
  By following these steps, you should be able to identify the root cause of the MW181 error and implement the necessary solutions to resolve it.