How to trigger Outputs?

Question: We have made a Z output type ZXXX of Customer PO ack type. The requirement is to trigger this output on the scenarios below and a few other sceniarios
1) Schedule quantity changes
2) Scheduled date changes

Can anyone please advice me as to how and where to go about coding for this. Thanks in advance.

Answer:
Should be possible without coding, so try asking in the appropriate functional group.
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