Delete a Part with multiple Whse

i have a problem for a while now but there must be a way to correct this, i have three plants. each plant is designed to have its own warehouse. So its 1:1 ratio (Plant a w whse a/ plant b w whse b/ plant c w whse c). Mistakenly a user created multiple new parts but accidentally assigned a warehouse from another plant to another plant ( plant a has whse a and wshe b/ plant b has whse b). the problem is that i cannot delete the part because there has been transactions. Is there a way to work around this?

All three whse are shared whse btw. Epicor has told me that once a whse is shared it cannot be unshared after transactions and therefore i cannot delete. Anybody has had this problem? 

Please help as reports are not reporting correctly. thanks!

Jose