We just recently updated to version 10.3, and I seem to have run into a bug between the two versions. When I attempt to force an editing cancel on the active cell on a grid while there is a validation error the method doesn't cancel the edit. 

Here is what I call on each of the grids:

            // clear out changes from grids

            this.dgItemsByLocation.ExitEditMode(true);

And this fails to clear the grid entry, and when I attempt this command in the debug it returns false from the method. Has the ability to cancel entries in the grid been disabled.

See the Screen Shot for a display of the grid after the ExitEditMode is called. It retains the invalid value, and fails to exit the edit mode.