Tax rate - item level

Hi,

A customer has a tax rate/area of X setup in P03013, and a sales order is placed for the customer for item Y. In P41026, for that item, the value 3 is setup in Item Branch Plant Sales Taxable (TAX1). I have set up in P4008 the tax rate/area Z with the item field populated with 3.

When the Sales Update (R42800) is ran, the created invoice has the tax rate/area of X. My question is the following: should the invoice have the same tax rate as the one defined at the customer level? Is there any way for the tax rate to be the one setup up for item grouping 3 (tax rate