Cannot Adjust Receivables Credit Note

Hi

We are trying to adjust a credit note that was wrongly recorded (Receivables module)

Despite I defined the respective adjustment approval limit, i still receive error stating that approval adjustment limits are not set for me,when do action>adjust and save the record, the adjustment stays in Awaiting Approval status and I cannot approve it.

Is there any other screen (apart from Approval Limits screen )where I should set a limit for Credit Note..

Thanks in advance