Is this issue only when you use the BAPI or as well when you do the manual entry?
for this error message exist 70 OSS notes.
also a KBA 1025810 - Field BKPF-BKTXT (doc header text) empty in the FI document
It might be worth to check a few of them yourself as we dont know in which release you are.
Please check ACC_DOCUMENT badi implemented. It effects BKTXT somehow at BAPI_ACC_DOCUMENT_POST . If it's implemented you need to assign it there again.
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