Other Item Constraints

Several other types of conditions can also be used in require constraints. In some cases these conditions do not make sense when used as the second operand in a require constraint. This is because some conditions are always true (message conditions), or the condition cannot be enforced to be true (linked item conditions).

The following table summarizes how to use item constraints.

Item Constraint	First Operand	Second Operand
Attribute Value	Yes	Yes
Consumes	No	Yes
Provides	No	Yes
Excludes	Yes	Yes
Excludes List	Yes	Yes
Require	Yes	Yes
Require List	Yes	Yes
Linked Item Value condition	Yes	No
Message, Recommends	No	Yes
Product Quantity	Yes	Yes
Relationship Quantity	Yes	Yes
Class Quantity	Yes	Yes