How To Fix /SCMTMS/PLN_VSR_OL391 - Assignment not possible; cannot change source location of first stage

SAP Error Message - Details

• Message type: E = Error

• Message class: /SCMTMS/PLN_VSR_OL -

• Message number: 391

• Message text: Assignment not possible; cannot change source location of first stage

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMTMS/PLN_VSR_OL391 - Assignment not possible; cannot change source location of first stage ?

  The SAP error message /SCMTMS/PLN_VSR_OL391 Assignment not possible; cannot change source location of first stage typically occurs in the context of SAP Transportation Management (TM) when there is an issue with the assignment of source locations in a transportation planning scenario. This error indicates that the system is unable to change the source location for the first stage of a transportation process, which can be due to several reasons.
  Causes:
  
  
  First Stage Constraints: The first stage of a transportation process often has specific constraints that prevent changes to the source location. This could be due to the configuration of the transportation lanes or the planning setup.
  
  
  Inconsistent Data: There may be inconsistencies in the master data, such as the location master data or transportation lane definitions, which can lead to this error.
  
  
  Active Transportation Orders: If there are active transportation orders or shipments that are already using the first stage, the system may prevent changes to the source location.
  
  
  Planning Parameters: Certain planning parameters or settings in the transportation management configuration may restrict changes to the source location.
  
  
  Solutions:
  
  
  Check Transportation Lane Configuration: Review the transportation lane settings to ensure that they allow for changes to the source location. Make sure that the lanes are correctly defined and that the source and destination locations are valid.
  
  
  Review Active Orders: Check if there are any active transportation orders or shipments that are linked to the first stage. If so, you may need to complete or cancel those orders before making changes.
  
  
  Validate Master Data: Ensure that the master data for the locations involved is consistent and correctly maintained. This includes checking the location master data and ensuring that all relevant attributes are correctly set.
  
  
  Adjust Planning Parameters: If applicable, review the planning parameters in the SAP TM configuration to see if there are any restrictions that need to be adjusted.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to transportation management for any specific guidelines or known issues related to this error message.
  
  
  Contact SAP Support: If the issue persists after checking the above points, consider reaching out to SAP support for further assistance. They may provide insights based on the specific configuration and version of your SAP system.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Familiarize yourself with relevant transaction codes in SAP TM, such as /SCMTMS/PLN for planning-related activities.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to identify the cause of the error and implement a suitable solution.