Paul,
Thankyou for the information to allow me go digging more into this.
What I found is there are no attribute rules configured on the feature classes within the asset package.
The database sequences & attribute rules are created when the package is deployed to an enterprise geodatabase. The sequences defined are for the assetid field.
I was going to ask where is this configured if not against the feature class and then I found the records in the B_AttributeRules table.
Thanks again for your help.