Cannot find data in custom table through out process

Dear All

I have a customized form which is being used to create orders in ONT. After order creation a process in pll library call reservation API to reserve quantity for that order. Procedure of reservation picks data from a custom table which holds lot wise quantity. Throughout all process that table holding lot wise item details does not show any data. My confusion is that how API picks data from that table. However I have seen there is data block in form for that table and it shows data at form when shown through canvas. Another confusion is that at which