Note:

Tax amounts posted to subcontract lines will not be included in the invoiced amount updated to SLIT (SL Items). Therefore, if you have set up a subcontract to include sales tax, it is suggested that you post invoices with the tax amount included as part of the gross amount and set this field to 0.00. If the subcontract is set up without tax and sales tax applies, then gross and sales tax amounts should be entered separately on the invoice line.