Check article number - Note in case of duplicate article number

This small module checks the item number to see if it already exists. If it does, you will be informed graphically.
Nevertheless, the entry is permitted (example: you are creating a new product and the old one is still online).

If the item number has not yet been assigned, a green tick appears.

Optional: with lock - no duplicate article number possible (no surcharge, but please let us know in advance).