I am experiencing the same problem.

Using an ObjectDataSource, the EntityViewModel type used by my ObjectDataSource is Decimal. The SQL backend data is Decimal 38,4 

It works properly if i use "10.1" but fails if i try to insert "10" or "10.0".

Did you find a solution for this issue?

Anyone out there with solutions? I have a case open with Infragistics but have no solution, yet.

Thanks,

Victor