"receipt number already exist" error (P03B102)

Hello,

I am trying to apply a credit note with an invoice manually through the P03B102 application and when I select both documents and specifiy the amount to apply, the system gives me the following error: "receipt number already exist. A form level error has occurred. The receipt number you have entered aleady Exist" (error ID 073C).

I serach this error in my oracle support kowledge base but nothing came out.

Could somebody help me with this issue?

Thanks.

Ezequiel