How to stop records in doubles before the Save as tabular form Oracle/Developer

Dear friends

I want to stop duplicate records to save in tabular form of oracle developer.

For example

I have a tabular form and there are three fields.

Vendor_id Item_id Qty.

1                  37630         1

1                  37630         4

Above in double item_id should not be saved.

Help, please

Concerning

Why not make a unique constraint on the database?

Kind regards

Zlatko

Tags: Oracle Development

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