PPR formatting and Transmitting

Hello

In R12 while processing PPR ,

1) it gets stuck in Formatting stage but file is sent to webmethods (Third party) to send it to bank. Even though we need to terminate the payment batch. This is causing huge issue for business. Question here is it should not send file to back unless confimed. Setting to automatic sending is off too.

2) Reason for formatting program error is JAVA Heap error. It is already set at 2048. When file size is less around 50 MB , it works fine.But when it crosses more that it goes into error.

We have around 2 GB payment files to process.