PL/SQL variables in contract expert rules

Hi:

PL/SQL variables are not displayed when creating contract expert rules (Condition section>Type: Variable). Why is this?

Oracle® Contracts Implementation and Administration Guide Release 12.1 Part No. E13469-04 states the following:

In the Type field, select one of the following condition types (...):• Variable: You can use the Variable type to create Clause Creation and Policy Deviation rules. Use this type for the Clause Creation rules if a system or user-defined variable drives the clause selection on a business document. For instance, bring Clause A if the variable Payment terms = Net 30 is in the document.

Thanks in advance,

Regards,