If you use form edit you can get the value of the others fields

using $("#mycolname").val() - where the mycolname is the name from colModel.

For other id's names refer to the appropriate documentation to see how they are constructed.

Best Regards

Tony

How can I do this? (refer to a different column from the one I am validating)

Something like: 

colModel: [

{name:'locked_flag',index:'locked_flag' editrules:{ custom:true,custom_func:lockedvalid } ...

{name:'locked_date',index:'locked_date', .....

]

function lockedvalid(value){
    
        if (value == 'Y' && locked_date.length == 0 ) {
            return [false,'Please enter a date to lock this record...',''];
        }
        return [true,'',''];
    }