If you are handling inbound vendor invoices via EDI using the INVOIC01/02 IDoc, there's more to success than just getting the segments mapped. Here's a rundown of the core configuration in OBCA, OBCB, OBCC, OBCD and OBCE and the IDoc segments that control G/L and cost center postings.

SAP Configuration: OBCA–OBCD

OBCA – Company Code Determination

• Uses partner type + partner number + company code name.
• Company code name is pulled from segment E1EDKA1, qualifier RE – field E1EDKA1-PARTN or E1EDKA1-NAME (if PARTN is empty).
• Allows invoice processing under multiple company codes for the same partner using shared mapping.

OBCB – G/L Account Determination

• Defines which G/L account is to be used per invoice line.
• Segment E1EDP19, qualifier 002 – field E1EDP19-IDTNR is matched to the Goods/Service number in OBCB.
• If no match is found, a default account can be used via wildcard (*).

OBCC – Additional Account Assignments

• Segment E1EDP02, qualifier 021 – field E1EDP02-BELNR is matched to the Account Assignment ID in OBCC.
• Used for bringing in cost centers, internal orders, profit centers, etc.
• Wildcard (*) can provide default values.

OBCD – Conversion of External Tax Rate to Tax Code

• Maps external tax rate to internal tax code.
• Driven by segments E1EDK04 (header tax) and E1EDP04 (item tax).
• Tax code returned based on matched entry in the OBCD table.

OBCE – EDI Invoice Program Parameters

• Controls invoice posting settings such as posting keys, tax calc, and document parking.
• Must be configured for each partner and company code combination.

Troubleshooting Common Errors

• If an IDoc fails, simulate the posting in FB60 or MIRO to reproduce the scenario.
• Run the IDoc in foreground mode to step through the BDC processing.
• Check FB00 user settings and ensure consistency between your user and the IDoc processing user.