SAP Message RQ283 - Subledger account selections restricted due to contract A/R & A/P

Diagnosis
The contract accounts receivable (FI-CA)is active and therefore it isnot possible to select customers or vendors.

Procedure
Subledger accounts can only be created together. If you specify theaccount type 'D', then the account type 'K' must also be specified andvice versa.
It is not possible to select customers or vendors.