No value found for Organizational Unit BILL_ORG

Hi Experts,

I am creating a Service transaction - Incident and then creating a follow up document (RFC). Upon saving the follow up document the system shows the following error:

An error occurred in system FEDCLNT200 during account assignment

Message no. CRM_ORDER_MISC 060

Orgfinder: No value found for Organizational Unit BILL_ORG (Notification E CRM_OFI 002)

I am not using any billing unit and do not even require one - also made settings for billing unit in Master data>Organization Management> Cross-system assignment of Org.Units... but still facing the same error

Kindly help.

Regards.