SAP Note 27681 - Invoice split due to different country entered

Symptom:

Old and new orders are not combined after changing the country in the ordering party's customer master record.

Cause and prerequisites

The country is adopted into the partner table of the document (VBPA-LAND1) from the customer master record.
Partner tables in the existing documents are not updated when the country is changed in the customer master.
For this reason, the partner tables in old and new orders are different,which prevents invoice combination.

Solution
Corrected from 3.0B