update function error

Hi everyone,

I am trying to update STATUS field in my database using update function but its showing the error "Cannot read property 'Context' of null".

Can you help me with this kind of error.

javascript Code

Reject : function(){
  var as = sap.ui.getCore().byId("idadmin1--idProductsTable").getSelectedItem().getBindingContext().getObject();
  as.Status="Rejected";
  var oEntry = {};
  oEntry.Empid = as.Empid;
  oEntry.Status = as.Status;
  sap.ui.getCore().getModel().update("/leave_set('" + oEntry.Empid + "')",oEntry, null);
  }
 

DATA: ls_user   TYPE zleave.
 
     io_data_provider->read_entry_data( IMPORTING es_data = ls_user ).
     UPDATE zleave SET
       status = ls_user-status
 
       WHERE empid = ls_user-empid.
 
     er_entity = ls_user.

above is the code from update_entity method.

Thank you

Anshul D