PO Output messages for ECS PO's
We are on SRM_SERVER 550, SAP 4.7 backend and are moving to ECS scenario (from Classic scenario).
Although we cannot change the ECS PO copy in R/3, I want to know if we can add new message types in the ECS PO copy which is stored in R/3
Does R/3 allow changes to the messages (adding new output message, Repeat Output or Change output) for ECS PO's?
How can we keep the functionality of adding new message types in the PO copy in backend?
Is there any other way/transaction/option available for this?