How To Fix /SCMTMS/OM231 - Cannot add assignment because item &1 is fixed

/SCMTMS/OM231 - Overview

• Message type: E = Error

• Message class: /SCMTMS/OM -

• Message number: 231

• Message text: Cannot add assignment because item &1 is fixed

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SCMTMS/OM231 - Cannot add assignment because item &1 is fixed ?

  The SAP error message /SCMTMS/OM231 Cannot add assignment because item &1 is fixed typically occurs in the context of SAP Transportation Management (TM). This error indicates that you are trying to add an assignment (such as a transportation order or a shipment) to a planning item that is marked as "fixed." A fixed item cannot be modified or reassigned in the current planning context.
  
  Cause:
  
  Fixed Assignment: The item you are trying to modify or add to is already fixed in the system. This means that it has been locked for changes, possibly because it has been confirmed or is part of a finalized planning process.
  Planning Status: The planning status of the item may not allow for further modifications. This can happen if the item has been processed to a certain stage in the transportation planning cycle.
  Configuration Settings: There may be specific configuration settings in your SAP TM system that enforce certain