Issue generating Cumulative Order Quantity referencing contract in SO

Hello friends, I am creating Sales Orders for different Sold-To-Party under the same Sales Organisation and same contract/SLA. I upload the various Sold To Party daily transaction via LSMW to the delivery note. When I create a sales order with reference to the Contract document and specify the Sold-To-Party, It will usually generate the cumulated ordered quantity. But the problem now is that some of the Sold-To-Party do not generate the orderd quantity at all, Please How do I rectify this issue?

Regards.