Configure the company as an withholding agent, changing the first position of the MV_AGENTE parameter to S.
Change the MV_TITRET parameter to T so as to indicate the generation of bills referring to the withholdings.
In the MV_NRETIGV parameter, indicate the types of receipt, separated by "|", for those for which there is no IGV withholding. Example: 05|12. These types must be the same which are in the Receipt Typesregister (Tax Records module) and which are used in the inbound/outbound invoices.