Upgrade the Domain Schema
When upgrading the application technology stack from 12.2.1.3 to 12.2.1.4 version the upgrade of the domain schema is not needed.
When upgrading the application technology stack from 12.2.1.2 to 12.2.1.4 version perform the following steps separately for both the FRDomain and OPADomain in the existing 12.2.1.2 User Projects Home.
Parent topic: Upgrade and Configure the Oracle Application Tier