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This is a fix for this issue:

Create a payment transaction group, a source reference will be generated (something like PTG0123. The field is read only on the form, so it's clearly not something we expect user to edit, but a kind of unique generated reference.

Clone that payment transaction group, on the cloned payment transaction group, source reference is empty.

The fix here is to generate a new source reference.

A side effect of these changes is that destination reference is no longer reset after clone, because before this Delivery_afterClone was used and this script reset both source and destination reference.