Vendor invoices can contain credit lines which must be posted with sales tax with a sales tax direction 'Sales tax payable'.

In the Vendor invoice approval journal, a checkmark field option can be used to determine the sales tax direction of a vendor journal line. The field is called 'Use sales direction from main account' and the sales tax direction on the main account setup is used.

The same option is required for pending invoice lines to determine the sales tax direction to 'Sales tax payable'