Add Partner to OP form for a specific sales rep

I am trying to add a partner thru a script (first tried a workflow but that doesnt work) but I can not get it to work! Can somebody have a quick look

 function SetPartner(type)   {    if ( type == 'edit' || type == 'create')     {       var record = nlapiGetNewRecord();      var salesrep = record.getFieldValue('salesrep')      if (salesrep == 5381) //5381 is our primary Sales Rep       {        var idx = record.GetLineItemCount('partner');                    record.InsertLineItem('partner')               record.SetLineItemValue('partner','partner', idx+1, 11623); //11623 is the partner that should connect to 5381              record.SetLineItemValue('partner','isprimary',idx+1,'T');               record.SetLineItemValue('partner','contribution',idx+1,'100');        }       } // End type  }