hi,
I have created custom record having freefromtext  field named company name.

above created field to be set to company name from configuration screen.on page load(view,create,copy,edit) on all event,
I have written following code,
if(type != 'delete')
{
  var companyInfo = nlapiLoadConfiguration('companyinformation');
  var companyName = companyInfo.getFieldValue('companyname');
  if(type == 'view' || type == 'edit')
  {
   var recordType = nlapiGetRecordType();
   var recordId = nlapiGetRecordId();
  
   var lRDeductor = nlapiLoadRecord(recordType,recordId);
   lRDeductor.setFieldValue('custrecord_companyname', companyName ,true);
  }

             }
I have also tried following code
if(type != 'delete')
{
  var companyInfo = nlapiLoadConfiguration('companyinformation');
  var companyName = companyInfo.getFieldValue('companyname');
                           nlapiSetFieldValue('custrecord_companyname', companyName , false);
            }

above both scenarios not working.