Problem with Submit statement into print program for delivery

Hi all,

i got a problem with the SUBMIT statement that i put into a print program associated to a delivery output message.

If i print the message by VL02N or VL71, everything works.

But if i associate the output with RV56ABST, the SUBMIT instruction isn't accepted and i get the message

"Processor ABAP: POSTING_ILLEGAL_STATEMENT"

There is any solution to this situation?

Why i cannot use the SUBMIT statement in this case?