Is there a unique fixed ID for each BOM in Bill of Materials?

[2208571753]

I want get a unique fixed ID of each BOM in Bill of Materials, dose it exist?

[A.Acheson]

Is the reference key what your looking for?

What workflow are you looking to utilize that requires unique ID? There maybe an easier method if we know more of the design intent. 

[2208571753]

Thanks for your reply

I just want to get the id of each bom item, and write the id into a database.
When the bom infos changed, i can edit the infomation in the database by id.