Can not take data from catalog attribute.

Good day!

I have document Coming, with table Productlist - with tabular section Product, Quantity.
I added new tabular section in ComingDocumentForm by name LoadingPrecent.
I want Items.Productlist.CurrentData.LoadingPrecent = Items.Productlist.CurrentData.Quantity / Items.Productlist.CurrentData.ProductLoading;

It is not working, say have no property ProductLoading
Note: Loading is property of Product.

if Loading is property of Product may be you need write

Items.Productlist.CurrentData.Product.Loading

Items.Productlist.CurrentData.ProductLoading;

Or maybe the ProductLoading column is hidden. In that case you need to mark Use always check box in the form attribute tree.

dear Ivan I have tried it also.

Let us see your configuration. Attach it to the message as .cf file, please. And describe where to see the place you are having a problem with.

Dear Admin, front of Loading have not a square box to change USE Always.
Product has checked box use always. But his property Loading has no even empty box.

(the properties is in other language so, I can not send you)

You can access this data at server. Not at client.

Thanks dear Timofey. Solved.

&AtClient
Procedure BeforeWrite(Cancel, WriteParameters)
If Items.Firm <> Items.InvoiceNumber.Owner then
  Cancel = True;
Endif;
EndProcedure

This say Owner is not found.
Note: Firms is Owner of InvoiceNumbers catalogues.

Same mistake: you are trying to follow a reference at client. To get this data 1C:Enterprise platform requires a server call and you should perform this operation at server.