2471897 - Trip cost assignment: How assign the trip cost to different company code ( "The CO assignment belongs to company code <1234>, not <5678>" error message)

You want to assign a trip to a cost assignment object (cost center, WBS element ...), which belongs to a company code different to the employee's master company code. The 2 company codes belong to the same controlling area.

It is absolute prerequisite to activate the company code validation in Controlling in OKKP transaction. Done that, when the desired CO account assignment is simply entered without also choosing the correct company code, you'll face an error message.  In any of the trip creation UIs you enter this cost object, for example a cost center, and you face the error message KI 100. For example in SAP GUI transaction PR05:

This error message occurs independently of the message control for message KI 100 in view V_T100C! Please mind: if the company code check would not be activated, this trip could be saved and posted. However: no cross company code posting would occur.

This behavior you'll face in all SAP GUI trip creating transactions as well as in the Web Dynpro ABAP based applications FITE_EXPENSES, FITE_REQUEST and FITE_EXPRESS_EXPENSES and the Fiori apps MTR V2 and MTE V2.

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