Hi nedski ,
Thanks for your post.
when I enter the SKU of an item to the search bar in Inbound Stock it shows some items on the PO but not others. Any ideas?
What do you mean? Do you say that some products you have in only one PO aren't included in the inbound list, but others are? Can you please be more specific? Some screenshots would help.
FYI, negative stock levels in products don't affect the inbound stock.