user receives "Goods Receipt Failed Email Notification" even though receipt is created

The user is receiving the "Goods Receipt Failed Email Notification" from Oracle even though after checking for the same, the receipt has been made. The receipt failed notification arrives just after the minute the receipt has been created.

The process that the business follows is as below:

Step 1: PO gets created

Step 2: PO gets invoiced and invoice is on hold(as receiving has not been done)

Step 3: Requestor receives the notification of Goods Receipt (Confirm Receipts process is scheduled every 2 hours)

Step 4: Requestor Receives from the notification -requestor receives only up to invoiced amount

After this, the issue arises as the user gets the Email Notification= Goods Receipt Failed, the very next minute. When the user goes into the PO, the receipt was actually created successfully , and the notification turns out to be faulty.