Constraint: Overview
This dependency type is mainly for intensively interactive configuration tasks and for configuration tasks in which you need to take into account the dependencies between the characteristics of several objects. The main purpose of constraints is to check and to ensure the consistency of a configuration.
The following video gives you an introduction into this topic.
The following figure shows you a Constraint in a Complex Multilevel Configuration.

Creating a Constraint
The upcoming video explains the creation of a Constraint.

Constraints can only be processed in a configuration if the dependency net and constraints are released.
Structure of a Constraint
The next video gives you an overview on the structure of a Constraint.