Oracle Access Manager default installation issue: ORA-00001: unique constraint (DEV_OAM.PK_ENTITIES) violated

When trying to set up a POC environment on windows 7, I've got this error.

You can solve that by:

set JAVA_OPTIONS=%JAVA_OPTIONS% -DDISABLE_CONFIG_ENTITY=true

You can find more detail below:
https://support.oracle.com/epmos/faces/DocumentDisplay?parent=SrDetailText&sourceId=3-11129429461&id=2034769.1