Ali,
>The problem is after we save data using the business object's SaveDataSet() method, a DataRow with all NULL columns are saved. All data assignments to individual columns are lost.
This might be a binding context issue. Try setting the child business object's AutoEndEdit property to true to see if that fixes the problem.
Regards,
Kevin McNeish
Eight-Time .NET MVP
VFP and iOS Author, Speaker & Trainer
Oak Leaf Enterprises, Inc.
Chief Architect, MM Framework
http://www.oakleafsd.com