How to change an item #?

I was testing out how to add and delete items, but noticed that the item number does not recycle (example - I deleted items #s 2-5, then the next item I entered, which should have become 2, instead was labeled 6). Maybe I'm thinking about it in terms of archival labeling, but is there a way to start over the item count? I'm thinking of the Item No as the Unique Identifier for the object.

-Tessa

That is an Omeka ID number that is automatically generated and unique. There isn't a way to start over.

If you would like to assign a different identifier, you can add one in the "identifier" field as part of its Dublin Core metadata.