Not able to do expense report adjustment in Oracle Project

Hi,

We are in R12.1.3. Previously, we did not allow for adjustment in expense report. Now, due to business need we thought of enabling this option. So,

- We ticked allow adjustment in the transaction source "Oracle Payables Expense Reports"

- Enable the default supplier cost credit account in implementation option

- Define and assign auto accounting rules for "Expense Report Cost Account" & "Expense Report Revenue Account".

However, after doing the above set up when I am trying to do adjustment for a line, its giving error and not allowing me to do the adjustment. As there is no error message, just the error symbol with the word error, so not able to find out where I am going wrong or did I miss something. Can you please help. Please find the screen shot of the error message.