Receipt Form Personalization

 Hi,

I done personalization in receipts form at Oracle Receivables Responsibility.

My personalization goal is receipt number filed will not allow duplicates for that I did like : 

Trigger Event : WHEN-VALIDATE-RECORD

Trigger Object : RGW_FOLDER

Condition : 0<>(select count(*) from ar_cash_receipts_all a where a.RECEIPT_NUMBER=:RGW_FOLDER.M_RECEIPT_NUMBER) and :system.record_status='INSERT'

Seq : 10

Type : Message

Message Type :  Error

Message Text : Please enter unique Teller Number

Its 100% working fine.

but when they are going reverse existing receipt, it's giving error. pls help me on this.

Thanks & Regards

Naveen.