SAP Message /IBS/RB326 - Unable to determine unique account/contract

Diagnosis
The system was unable to find a unique account/contract.
or
The function was canceled by the user.

System Response
Processing is canceled.

Procedure
Check whether an account or contract with the reference you enteredactually exists in the source system.
This message is generated for source systems that are linked (remotelyor locally) via BAPIs. In Customizing, check whether the entries for"Define Systems to be Linked" and "RFC Table for Extractors of LinkedSystems" are correct.

Procedure for System Administration
Tables /ibs/crb_rfcxtra and /ibs/crb_modid_p
Check extractors.