Your customer accounts revenue based on, product class category.

Ref:https://docs.oracle.com/en/cloud/saas/project-portfolio-management/19b/oapfm/proj ect-foundation-configuration-define-types-and-categorizations.html#OAPFM222700

Topic - Manage Project Class Categories

Setting Up Class Categories: Points to Consider

Available as Accounting Source

This option indicates if theclass category is available as an accounting source so that Oracle Fusion Subledger Accounting can use the category to create mapping sets, account rules, journal line rules, and description rules.

Only one class category at a time is available as an accounting source in Oracle Fusion Subledger Accounting. To change the class category that Oracle Fusion Subledger Accounting uses, deactivate the old class category and create a new one with a different date range.