I have problem integration addional data into a formsubmit. I using the form whcih comes witzh jqgrid, not inline cell editing:

I have to add a addional values like referenkey from a parent object to the form submit:

thus I added

onclickSubmit:function(){return {item_id:};},
editData: {item_id:11},

according to the doc. Both should add a parameter 'utem_id' with value 11 to the postrequest. But it doesn't!