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

/SCMTMS/PLN_VSR_OL391 - Overview

• 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

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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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