Diagnosis
The account determination key &V1& cannot be mapped for:
Calling System ID1 &V2&
Calling System ID 2 &V3&

Procedure
In Customizing for TTE
Choose Assign Objects from External System.
Choose system &V2& or &V3&
Choose Accout Determination Key.
Enter the required data.
Choose Save.
To update the Customizing settings immediately, callImmediate Customizing Refresh