Braincracking problem: some orders receive an additional line item.

Hello,

In several PO's we have a strange thing happening:
In some cases an additional line item gets added with a pallet. This is not unwanted, but nobody here has a clue how these get added.

The problem is that the pallet (=article) gets added to the order, but this pallet has a setting wrong so we manually have to edit this in the PO. Normally we can fix this in the info-record to prevent it in the future, but because these are auto generated, there is no info-record.

I tried looking for cross-sale references but no table showed up with anything, nor did I see a correlation between either the suppliers or the articles used.

Is there anybody here that has a clue where this might be done or where I might find a clue?