jqGrid update field "editable:false"
===

I'm using **jqGrid**, I have edited a row then I saved it, all data is sending to the update url.<br/>
But I have a problem, if "***editable:false***", , in the **"firmasID"** field <br/>
I have been  receiving an empty   **firmasID** value.<br/><br/>
	

     $("#companies").jqGrid({
    		 url:'/load/rateseditor_companies/controller/load/',
    			datatype: "json",
    		   	colNames:['ID','FinSysID', 'Company', 'Code','Code sparcs','Jur address','Address2','Phone','Fax','Email','Contract Date','Bank accaunt','Bank id','Price list','KonsignTab','Remarks','BankID USD','Bank accaunt 1','BCT bank','Resident','Days to pay'],
    		   	colModel:[
    		   		{name:'firmasID',index:'firmasID', width:55},
    		   		{name:'FinSysID',index:'invdate', width:90, editable:true},
    		   		{name:'firmasNosauk',index:'Company', width:100,editable:true},
    		   		{name:'firmasKods',index:'Code', width:80, align:"right",editable:true},
    		   		{name:'firmasSPARCS',index:'Code sparcs', width:80, align:"right",editable:true},		
    		   		{name:'jurAdrese',index:'Jur address', width:80,align:"right",editable:true},		
    		   		{name:'nosAdrese',index:'Address2', width:150, sortable:false,editable:true},
    		   		{name:'Telefons',index:'Phone', width:150, sortable:false,editable:true},
    		   		{name:'FAX',index:'Fax', width:150, sortable:false,editable:true},
    		   		{name:'Email',index:'Email', width:150, sortable:false,editable:true},
    		   		{name:'piegLigumDat',index:'piegLigumDat', width:150, sortable:false,editable:true},
    		   		{name:'bankasReķins',index:'bankasReķins', width:150, sortable:false,editable:true},
    		   		{name:'bankasID',index:'bankasID', width:150, sortable:false,editable:true,edittype:"select",editoptions:{value:getBanks()}},
    		   		{name:'cenLapa',index:'cenLapa', width:150, sortable:false,editable:true},
    		   		{name:'konsignTab',index:'konsignTab', width:150, sortable:false,editable:true},
    		   		{name:'piezimes',index:'piezimes', width:150, sortable:false,editable:true},
    		   		{name:'bankasIDUSD',index:'bankasIDUSD', width:150, sortable:false,editable:true},
    		   		{name:'bankasRekins1',index:'bankasRekins1', width:150, sortable:false,editable:true},
    		   		{name:'BCTBanka',index:'BCTBanka', width:150, sortable:false,editable:true},
    		   		{name:'Rezidents',index:'Rezidents', width:150, sortable:false,editable:true},
    		   		{name:'Days_to_pay',index:'Days_to_pay', width:150, sortable:false,editable:true}
    		   	],
    		   	rowNum:22, 
    		   	rowList:[10,20,30],
    		   	pager: '#pager2',
    		   	width: '100px', height: "500px",
    		   	sortname: 'firmasID',
    		    viewrecords: true,
    		    sortorder: "desc",
    			editurl: '/load/rateseditor_companies/controller/update/',
    			caption: "Companies list"
    		});