BOM items into MRP Module can not filled by Storage items

Hi,

I’ve a problem making a BOM in MRP module.

When I’m filling BOM lines, COMBO Box present me only about 1500 items from product into Storage.
My total items into sotrage are about 5000 items, so I can not generate a BOM because only about 1500 of them are pickable.

Previous versione (11.x.x) worked good, also if MO module was in developing, but olds BOMs have items picked from all items storage list.