No Output Message Required On PO change

Hi,

Our client does not want the output message to be generated automatically in case of changes being done in a PO....while the automatic determination of output message should continue in case of a New PO.

We have done the config settings in the Fine Tune control of the message types and have deleted the change related entries against the message types

What happens is when a PO is generated and the output is PROCESSED, if we go and change the PO, it again generates an output message with NEU as the message type....and the change indicator is not ticked!!! We do not want this to generate automatically.......

Can anyone suggest how to overcome this issue?