2760501 - Inbound Message returns "ISO code EA not unique" (SFB702) from SAP Transportation Management

• SAP Transportation Management (SAP TM) integration with ERP or EWM.  
   
• Inbound message from ERP or EWM is returned with Error message:
  
  Error during proxy processing An exception with the type CX_GDT_CONVERSION was raised, but was not handled locally or declared in a RAISING clause. An error occurred during conversion between XML format and the SAP internal format 
   
• Trace for the returned message includes the following error
   
  

  <CX_GDT_CONVERSION>
      <MESSAGE>
          <TYPE>E</TYPE>
          <ID>SFB</ID>
          <NUMBER>702</NUMBER>
          <MESSAGE>ISO code ?? not unique</MESSAGE>
          <LOG_NO/>
          <LOG_MSG_NO>000000</LOG_MSG_NO>
          <MESSAGE_V1>??</MESSAGE_V1>
          <MESSAGE_V2/>
          <MESSAGE_V3/>
          <MESSAGE_V4/>
          <PARAMETER/>
          <ROW>0</ROW>
          <FIELD/>
          <SYSTEM>SD0CLNT111</SYSTEM>
      </MESSAGE>
      <GDT_NAME>UnitCode</GDT_NAME>
      <GDT_VALUE>??</GDT_VALUE>
  </CX_GDT_CONVERSION>

  where the unit "??" above would take on a unit of measurement ISO code.

• This error is returned from method UNIT_CODE_INBOUND(CL_GDT_CONVERSION)

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• SAP Transportation Management 9.x
• SAP Transportation Management embedded in S/4HANA 1709, 1809

SAP S/4HANA 1709 ; SAP S/4HANA 1809 ; SAP Transportation Management 9.0 ; SAP Transportation Management 9.1 ; SAP Transportation Management 9.2 ; SAP Transportation Management 9.3 ; SAP Transportation Management 9.4 ; SAP Transportation Management 9.5

  CUNI, T006, EA , KBA , TM-INT-EWM , TU-Based Integration with Extended Warehouse Management , TM-INT-LI , Logistics Integration - General , Problem