When releasing structure changes to the Unit dimension
In general, you should not consolidate while changes are being made to the structure of the application. When you release unit dimension structure changes to the database, you are effectively introducing these changes to the application while another process (the consolidation) is relying on the old structure. This can produce errors and unexpected results from the consolidation process.
Never run a consolidation when a release deletes members from the production database. This would result in a consolidation failure if the consolidation tries to insert a row for the deleted members.