SAP Message CA_TTE431 - If TTE and calling system have different tax type codes, check assignment

Diagnosis
Tax type &V1& cannot be mapped for:
Country &V2&
Calling System ID &V3&
Calling System ID 2 &V4&

Procedure
In Customizing for the TTE,
Choose Assign Objects from External System.
Choose system &V3& and/or &V4&.
Choose Tax Type Assignment.
Maintain data for country &V2&.
Choose Save.
To update Customizing settings, choose ImmediateCustomizing Refresh.