Can I select reference directories in a document only once?

Question

1C

Is it possible to do this so that in the document - in the tabular part, we do so in order to select only one link of this product from the "nomenclature" directories?

Answer 1

The question is not very clear.
What exactly needs to be done?

Answer 2

You hang up check on event At the Choice for a cell. And you turn on the control, you can select an element. You compare the already selected, earlier, with the current one.
For beauty, turn off the drop-down list "History of choice"
From practice, it is a very exceptional case when customers ask for this.

Answer 3

It is necessary to forbid a choice of the duplicating record?
Can simply at further processing by requests to use GROUP? The nomenclature will collapse into one, and the quantity and amount will be summed up