Create Accounting Receiving has exceptions with 95314 errror

Hi all - we are running 12.0.6. and have exceptions with 95314 error number on the Create Accounting - Receiving. These are for the event type Accrual Write Off for which I can't seem  to find any hits on Metalink specifically for this event type in relation to 95314 although there are numerous examples for Invoice,Payment and Prepayment.

The messages are as follows:

 

There is no entered amount for the subledger journal entry line. Please inform your system administrator or support representative that: The source assigned to the accounting attribute Entered Amount has no value for extract line number 1. Using the Accounting Attribute Assignments form, assign a source to the accounting attribute Entered Amount that provides a valid value