Opportunity ID Incremental Number ID

Hi,

We're looking to have incremental ID's for our Opportunities, similar to that of Case & Solution.

I'm wondering if it's possible to, after having created a field on the opportunity entity call OppoRefID which will use a stored procedure. To then change the current eware_default_values stored procedure from ELSE IF (@table_name='Solutions') AND (@field_name = 'Soln_ReferenceId') to ELSE IF (@table_name='Opportunity') AND (@field_name = 'oppo_opportunityrefid')

Would this work? We're not going to be using the Solutions Entity at all.