SAP BP: R1 473 during Business Partner create/change

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Symptom
When you try to create or change a Business Partner through web UI or through Business Partner BAPIs, you encounter an error R1 473. This happens only when you have extended the domain BU_CONTACT.
Other terms
BU_CONTACT, BAPI_BUPA_CREATE_FROM_DATA, BUPA_CREATE_FROM_DATA, BAPI_BUPA_CENTRAL_CHANGE, BUPA_CENTRAL_CHANGE, BUP_CHECK_CONTACT, R1 473, Business partner &1:Invalid value &2 for field &3, BAPIBUS1006_CENTRAL-CONTACTALLOWANCE, [...]

Extensibility: Code list retrieval for extension fields

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Symptom
For stand-alone data type enhancements of type ‘Value Help’ which were created using the extensibility workbench /EXT/WB, the code list values are not retrieved and the corresponding extension field appears in the customer UI as a normal input field instead of a code field.
Other terms
Extensibility; extension field; code list
Reason and Prerequisites
Data type [...]

SAP-BP: Error R11 401 during address creation for country

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Symptom
When creating an address using BUPA_ADDRESS_ADD (or any application that makes use of BAPI_BUPA_ADDRESS_ADD , e.g. CRM PCUI ) , error R11 401 may be encountered- “Enter a value for field Country ISO code”. However, the field ‘Country’ has already been filled.
Other terms
R11 401, R11401, BUPA_ADDRESS_ADD, BAPI_BUPA_ADDRESS_ADD, COUNTRY, COUNTRYISO, TBZ3R_BD, COUNTRY_CODE_SAP_TO_ISO, “Enter [...]