Vertex Taxes and JDEdwards

Hi Comm

what are the steps if necessary to prepare JDE for vertex use for sales and purchases. Is there any special setup to be used ,constants etc or anything turned on or off in the sales and procurement modules. What makes the system look at vertex instead of any defaylt JDE tax setup at the cuatomer / vendor level.  DOes anything have to be done at the customer/vendor level to ensure that the vertex rate si always applied

Thanks in advance