it deals with the modification you did last time for Packaging component.
Actually the OPC code (mtl_system_items_b.attribute1) which is optical code and unique for each item, has no sense for packaging component.
So it must be created when the packaging component is created.
The dummy OPC code for packaging component is based on sequence (you have to create DB sequence) prefixed by P letter (P stands for Packaging)
P+9digits (from DB sequence)
you can start the sequence at 1 and left pad with 0.
you'll find in the specs the list of item type for which the OPC has to be computed (SEGMENT, CUP, etc)
For testing, I've asked file to project team. I'll send it to you as soon as possible.