Could not find tax when adding product to PO Line

When adding a Purchase Order Line, the tax cannot be found even if tax rate and tax category defaults have been defined. Tax Category has also been set for the price list for all products tested. Strange that the tax being searched is for sales.

"Error: Could not find tax…
Server error
Could not find tax - Product: 1000004_Kraft Liner Board 200gsm - Sales Transaction: No - Date: 08/04/2020 - ShipTo: 4120 Kalayaan ave, 1205 MakatiPhilippinen OR - BillDate: 08/04/2020 - Invoice To: 4120 Kalayaan ave, 1205 MakatiPhilippinen OR
"