How To Fix /SCMTMS/TRQ421 - Enter another partner; partner already specified in order

/SCMTMS/TRQ421 - Overview

• Message type: E = Error

• Message class: /SCMTMS/TRQ -

• Message number: 421

• Message text: Enter another partner; partner already specified in order

Self-Explanatory Message

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/SCMTMS/TRQ421 - Details

• The SAP error message /SCMTMS/TRQ421 Enter another partner; partner already specified in order typically occurs in the context of SAP Transportation Management (TM) when there is an attempt to assign a partner (such as a carrier, shipper, or other business partner) to a transportation order that has already been assigned a partner of the same type.
  
  Cause:
  
  Duplicate Partner Assignment: The error is triggered when you try to assign a partner that has already been specified in the transportation order. For example, if a carrier has already been assigned to the order, trying to assign the same carrier again will result in this error.
  Incorrect Partner Role: The partner role being assigned may already be filled by another partner, leading to a conflict.
  Data Entry Error: There may be a mistake in the data entry process, where the user inadvertently tries to assign a partner that is already linked to the order.
  
  
  Solution:
  
  Check Existing Partners: