PO release strategy for PO change only

Hello SAP Experts,

We are automatically create PO through some interface / portals. Hence PO release strategy is not required during PO creation.

However, later those POs are getting amended due to some reasons. Now we want to trigger PO release strategy for PO changing.

Please let me know, if it is possible to trigger / configure PO release strategy only for PO change and not for PO creation.

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Deepak