We are not able to perform aggregation method sum on Data Table decimal field, it will show "No generic method 'Sum' on type 'System.Linq.Enumerable' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic." exception, It will be much useful for the user, once it is rectified.
This seems like an issue with your data source configuration. Would you mind posting a formal support incident using our forums or support system? Thanks,
Above mentioned Issue will prevent aggregate operation like Max(), Min(), Avg() and Sum() with Data Table fields. Your valuable response are much appreciated.