final invoice after validat a prepayment invoice customer

souoik

Hello
I would like to change multiple line when a valid end customer deposit invoice, in writing the book table the system displays a line of advance VAT in the debit portion down * is in the part it calculates credit or for amounts of VAT in line vAT sales final invoice, i want the system does not calculate the vAT payment pending the validation final bill then, what codunite view or is the system calculates the lines affect in the table 17