SAP Message UT121 - Object & has not been imported yet (R3trans)

Diagnosis
You want to import the object &V1& in the request &V2&. However, theprerequisites for the logical import of this object have not beenfilled; the main import of the object has not yet been carried out.

System Response
The logical import of the object is not executed.

Procedure
Check the transport log and repeat the main import of the request.