Hello,

How about using the custom validation.

Define the custom validation into editorOptions and extract the other value with editorForKey method.

features: [{
 name: 'Updating',
 editMode: 'row',
 columnSettings: [
  {
   columnKey: "UnitsInStock",
   validation: true,
   editorOptions: {
    validatorOptions: {
     custom: {
      method: function(value, fieldOptions){
       var someOtherEditor = $('#table1').igGridUpdating("editorForKey", "UnitPrice");
       var someOtherEditorValue = someOtherEditor.igTextEditor("value");
       if (someOtherEditorValue === "$ 1000") {
        return false;
       } else {
        return true;
       } 
      },
      errorMessage: "Value did not match"
     }
    }
   }
  }
 ]
]