It is possible to link a license with a purchase license by selecting a purchase license from the drop-down list in the dialog Edit license > tab General. If the period of a linked contract/license is changed, the system executes an automatic check; if the period is exceeded, the system emits a warning. When a purchase license and a sales license are linked, the usage numbers are calculated as follows:

• Purchase: purchase minus number of sales
• Sales: number of broadcasts of the windows