A few points from my side (I hope that you are well aware of these and apologies for stating something obvious):
My understanding is that you do not aim to make these mandatory at document creation and end up in error, but at a later point in time. I am saying this, because for example NL deliveries are always created in background, also most LFs are created via mass processing, which means that the user has no way to populate the values during creation. If I understood correctly, this information is not available at the point of delivery creation, anyway. Is it technically possible to retrieve this data (BOLNR, XABLN) from elsewhere or it does not exist in SAP, but on some pre-printed papers? If it does not exist in SAP and there is no way to get the data into the system via other means, then the users will appreciate if you introduce an easy to use transaction for them to populate multiple documents in a single screen.
In standard, I believe, actual goods issue date is populated automatically when you process goods movement. Is this not happening in your case or you need to have a different date there for some reason?
As for BOLNR and XABLN, you could try incompletion at goods issue or at billing (before that I would not expect to have reliable information).
Another possible solution worth checking (I admit, that I have not worked on such requirement and cannot verify at present whether it is suitable): if_ex_le_shp_delivery_proc (there is a method change_field_attributes, which looks promising and some methods to populate or change existing data at header level).
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