Document Category for an Imported Supplier Invoice- Italian requirement

Hi Experts

We have a legal Requirement in Italy, where Document Category should default to AP invoice header from the supplier site GDF.

We assign a category to the supplier site. The doc cat defaults to the invoice when its entered manually. But for the invoices imported, invoice looks for the cat in the interface table and doesnt look for, at the supplier site details.

Hence for imported invoices, when the category is blank in the Interface, the Doc category is defaulted as standard invoice. In italy , we need to override with the value we have given in the supplier site.