ar_invoice_api_pub.create_single_invoice returns SUCCESS but customer_trx_id returned as blank

Hi Experts,

    I'm using 12.2.4 release and used   ar_invoice_api_pub.create_single_invoice API to create the AR invoices . We don't have tax or sales credit concept. Only we need to create an AR invoice.  This API was working fine,  but after sometimes it's showing a different behavior that, it returns a SUCCESS (S) status but customer_trx_id returned as blank, meaning invoice is not created ... Can anyone please tell me the possible scenarios for this issue and how to solve this.

--

--

FND_GLOBAL.APPS_INITIALIZE

   (

user_id       =>  l_user_id,           --  Application User ID

resp_id       =>  l_resp_id,           --  Responsibility ID