How to configure Canadian taxes for Quebec for set off of QST?

Hi friends,

We have a direct shipment process where by the customer places the order and the vendor ships directly to the customer. The PO defaults the tax code IR in the invocie settings and calculations take place accordingly.

However, we need to take a set off for the QST and HST for Quebec and Maritime provinces respectively. In the current process, these tax amounts are hitting the inventory ane expense accounts, not the tax account because of which we are not able to take the set offs.

Wondering if anyone else has had this problem and how can we resolve it? We use Vertex but somehow need to configure the tax code IC instead of the current IR to get the results. How to get this fixed? Obviously this situation is only for Quebec & maritime.

Many thanks for your help.