From the Configuration
Rules page, click Product Compatibility Rules.
The Product Compatibility Rules page opens.

It contains the following columns:
Name. The name of the compatibility rule.
Left Expression. The left expression defined
in the rule equation.
Compatibility. The operator used to compare
the left expression and the right expression. Valid values are compatible,
requires, incompatible, and co-dependent.
Include Future Revisions. Shows the direction
of compatibility: upward (includes higher revisions of the product that
is present in the right expression), downward (includes lower revisions
of the product that is present in the right expression), all (includes
all revisions of the selected product), or none.
Right Expression. The right expression defined
in the rule equation.
Owner. The person who is responsible for the
rule. By default the person who creates the rule is the owner.
Edit. Click
to edit the product
compatibility rule. The left and right expression fields are pre-loaded
with the existing values found in the database. You can add to the existing
expressions, or erase the existing expression to create a new expression.
For details on creating new expressions, see Creating a Product Compatibility Rule.