The bill to Contact field is populated with Actual Contact id instead of Contact seq num.

In the contracts->bill plan-->Bill to contact field,is initially populated with correct contact seq num.

But somehow after amendment is done,the value of the BILL TO CONTACT field changed to actual CONTACT_ID for the customer.Due to this when interface process triggerred,there was an error captured in INTFC_BI record with -0080(Invalid Bill to Contact).

Not sure how the CONTACT_ID is displayed in this field .

Any help on this issue would be appreciated.