PATTAR: PRC: Interface Invoices to Receivables error - Auto Accounting could not create Flexfield

We are on r12.2.4 - we are having the below issue in Project billing:

PRC Interface Invoices to Receivables - goes in error - Auto Accounting could not create flexfield.

We did the Autoaccounting rules assignment as below for : Revenue and Invoice Accounts

All the transaction types as below:

Receivable account, Rounding account, Unbilled receivable, Unbilled Retention, Unbilled Revenue, Rounding, Invoice writeoff , Realized gains and loss... but I did not find one for Revenue account..

I setup a simple rule for each segment with a constant value...

But still get the error. Is there anything I am missing.

Any suggestions will help.