Hi Jaime,
As per your screenshot,
Accont Determiantion group (ADG) for material is Z001 and ADG for supplier is 4010.
Inbound Delivery which has this issue, has supplier Which is assigned to 4010?
Basically this means, row in the screenhsot means that if ADG for material is Z001 and ADG for supplier is 4010 then only respective GL would be derived.
You can leave ADG for supplier blank, which means for ADG for material Z001 and any Supplier ADG, system will use respective GL.
If everything seems to be correct, Have you tried to post the affected delivery again?
Can you provide following screenshots in case of error
1) material -> Financial data, -> ADG assigned
2) Supplier -> Financial Data -> ADG Assigned
3) Inbound Delivery
Regards,
Harshal