There is no Duplicate Invoice Check for Journal Entry Post API Synchronous or Asynchronous
"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."
S/4 HANA Cloud
The duplicate invoice check is a online functionality. This check is not available in API's, BAPIs or Idocs.
The system is working as designed.
Duplicate invoice check is not intended for use with automatic transactions such as the use of the API, BAPI or IDoc's. It is meant to prevent a user from inadvertently keying in the same invoice twice.
This note is cloud relevant.
F5117, M8108, M8462, M8804, M8805, duplicate, SSCUI, 102091, BAPI, JournalEntryCreateRequestConfirmation_In, JournalEntryBulkCreationRequest_In, Journal Entry Post API, Synchronous, Asynchronous, BAPI_ACC_DOCUMENT_POST, double, duplicate, MRM_FI_DOCUMENT_CHECK, FI_DUPLICATE_INVOICE_CHECK, MRM_DUPLICATE_INVOICE_CHECK, JE, multiple, CLOUD , KBA , AC-INT , Accounting Interface , FI-FIO-GL , Fiori UI for General Ledger Accounting , FI-FIO-GL-CA , Configuration for General Ledger – Account Determination , Problem