Maintaining contiguous code id's by applying business rule

I deleted some records out of an entity, I'd like to keep the Codes as contiguous and incremental, meaning no breaks between the code numbers.

I created a business rule and applied it but codes remain the same.

I used the "Default to a generated Value" action, then selected the Code attrib. --Saved.

Then back to the Entity, I applied business rules. But nothing seemed to have happened. As there was no change in codes.

There are no validation errors either.

What might I be missing?

--ACG