Comparison Date

It is only by comparing a drawing at two states or sessions that it is possible to determine what has changed. Using the current state of the drawing as one state, you must then reference an earlier state in order to make the comparison. You do this by specifying a Comparison Date: (COMPDATE), that is, the drawing state at a time that you wish to use as a baseline or datum.

If no Comparison Date has been defined, then an error is raised and isometric production is aborted.

The Comparison Date is set from the Set Comparison Date form.

The Comparison Date can be set in one of two ways:

• By specifying an actual time and date.

• By referencing a Stamp.

A Stamp is a way of referencing combinations of databases and sessions at specified instances. Stamps are created in Admin. for further information on Stamps and how they are created and used refer to the Administration User Documentation.