Unable to generate multiple PO-Print Output (PDF) from schedule process screen

Summary:

Unable to generate multiple PO-Print Output (PDF) from schedule process screen after running ESS Job 'Communicate Purchasing Documents'

When we select Document Selection = Specified and put Document number , when the program succeeded it give pdf output, which is fine.

Challenge is When we select document selection = New or changed or New and Changed , when the program succeeded , it does not any pdf output.

So the question is this ESS Job 'Communicate Purchasing Documents' will it always give single PO output or something we are missing as a part of configuration that needs to setup to generate multiple pdf output from schedule process screen.