Freight line type in PO

Hi,

We have a requirement to have freight as line type for few specific business scenarios. If I define a line type (in Purchasing) for Freight will it work fine when invoiced. When invoice is matched to the PO, it should have the item line, freight line and tax - all coming from the PO. At this point we have the item line and tax coming from the PO but not the freight. We have shared inventory (that comes with Purchasing) and all purchases are either expense or capital. With freight line setup will it cause an issue for 3 way