My Client Is working at Construction Field ,With Job Order Basis We will Create the Contract And Define All Item In Contract as it's . like ( Item Code - UOM - Unit Price ) For Each Job Order I Will Raise Invoice Invoice Line Should Be From Contract Items with unite price My Client Choose Contract Item in Invoice manualMy Client Is working at Construction Field ,With Job Order Basis We will Create the Contract And Define All Item In Contract as it's . like ( Item Code - UOM - Unit Price ) For Each Job Order I Will Raise Invoice Invoice Line Should Be From Contract Items with unite price My Client Choose Contract Item in Invoice lines manual How Can i Do This ? i should have Oracle Service Contract ? or DTS ?