ISupplier Invoice getting wrong tax codes from AP invoices

Hi All,

I am working on the implementation of the process "Create Invoice Without PO" in iSupplier. And we are not able of validating those invoices in AP for Distribution issues. The system tells that not all distributions information are complete.

And when running validation, we get different holds, as the TAXes are getting recalculated and they do result reprocessed with different TAX codes from the one we had as default in iSupplier.

While we succeed validating the invoice, only when the tax codes in iSupplier (modified manually) so the are the same as in AP.

Have any had such issue? Would it be possible to prevent the iSupplier from getting the tax codes? So we do it only in AP?