Hola Andres
Revisa en la TC OBX1 si existen las claves de contabilizacion automaticas que se usan en las transacciones FB50, FB70 ..
Por otro lado te voy a adjuntar la NOTA SAP 201820 que da la solucion de tu problema:
FB60, FB65, FB70, FB75, F5817, E817.
Reason and Prerequisites
The problem is due to missing Customizing.
Solution
Carry out the following steps:
1. Maintain the posting keys for automatic G/L account postings using Transaction OBX1 or via the following path in Customizing:
Financial Accounting > General Ledger Accounting > Business Transactions > G/L Account Posting > G/L Account Posting - Enjoy > Define Posting Key for G/L Account Posting
Enter posting key '40' for 'Debit' and the posting key '50' for 'Credit'.
2. Using Transactions OBXJ and OBXW maintain the posting keys for the G/L account line items of outgoing and incoming invoices in a similar way.
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