Journal Entry Search doesn't return line credit amount

I am trying to get the credit amount from journal entry lines but the following code returns null for the credit amount. The problem is it is not returning the detail from the sublist (lines). Can anyone help?

var newfilters = new Array();
      
           newfilters[0] = new nlobjSearchFilter( 'trandate', null, 'on',  glDate);
           newfilters[1] = new nlobjSearchFilter('account', null, 'anyof', '2092 Project Variance');
           
       var newcolumns = new Array();       
           newcolumns[0] = new nlobjSearchColumn('credit');       
           newcolumns[1] = new nlobjSearchColumn('department');
           newcolumns[2] = new nlobjSearchColumn('class');
           newcolumns[3] = new nlobjSearchColumn('trandate');
           newcolumns[4] = new nlobjSearchColumn('location');
           newcolumns[5] = new nlobjSearchColumn('customer');
   

           var newsearch = nlapiCreateSearch('journalentry', null, newfilters, newcolumns);
           newsearch.addFilters(newfilters);

            var newsearchs = newsearch.runSearch();