Symptom
There is an error 'An entry is required in field Language Key' when customer wants to save the BP.
Environment
S/4HANA Cloud
Cause
This BP has multiple addresses and the language of one of the addresses has no value.
Resolution
Go to the address overview tab and double confirm all the address language fields have been maintained.
Keywords
maintain business partner, language key, an entry is required , KBA , LO-MD-BP , Business Partners , How To
Product
SAP S/4HANA Cloud 2302