2 data grid combined as 1 and how to set the data grid editable when another 1 error occured

I have create 2 data grid and locate both of it side by side. The data grid allows user to edit and when the value range "0 > input" or "100 < input", error icon will be displayed.

However, when the data grid 1 error has occurred, user still able to edit the data grid2. How to do when 1 of the data grid error has occurred, user unable to edit another data grid. Any suggestions for this case or proper fixed for this ?

Using WPFToolKit Data Grid, because current project version is .Net 3.5

Target data grid view