How to apply credit memo to a closed transaction uisng API in AR?

Hi All,

I have a requirement to apply credit memos to closed transactions in AR.

I am using this API ar_cm_api_pub.apply_on_account to do the same.

But everytime I try I get the following error message :

1. Invalid customer transaction identifier.

I am passing the correct customer_trx_id  for invoice and credit memo,still I get the same error.

I had tried from front end as well,but enabling the show closed invoices option ,I couldn't find closed invoices in my lov to apply.

In the API also I have enabled the show closed invoices option.