SAP BP: Cannot add or change address to a Business Partner

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Symptom
Add/change of an address to a Business Partner is not possible when there is an RFC communication error
Other terms
BUPA_ADDRESS_ADD, ADDR_DUPLICATE_CHECK_FOR_BAPI, RFC error, communication error, BAPI_ADDESS_CHANGE, BAdI ADDRESS_SEARCH
Reason and Prerequisites
When a foreign application tries to add/change an address to a BP, the process ends if there is an RFC communication error while calling the [...]

Incorrect duplicate check occurs on changing BP name

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Symptom
When the business partner name is changed using Web UI or BAPI_BUPA_CENTRAL_CHANGE or BUPA_CENTRAL_CHANGE, the BP gets identified as a duplicate. However, the results returned are incorrect and do not match the duplicate check criteria.
Other terms
BAPI_BUPA_CENTRAL_CHANGE
BUPA_CENTRAL_CHANGE
ADDRESS_SEARCH
DUPLICATE CHECK
Reason and Prerequisites
The module BUPA_CENTRAL_CHANGE contained structures to accept only central data fields. Hence, on changing [...]