Unable to create an entity object from R12 Jdev . why can’t choose object type under database schema when creating a new entity object(EO)

Unable to create an entity object from R12 Jdev .
why can’t choose object type under database schema when creating a new entity object(EO)

1) Follow the step as ‘Setting Up Your Development Environment’ in the Oracle Applications Framework Developer’s Guide, and then Configure the JDEV_USER_HOME environment variable as :\jdevhome\jdev, the issue can be re-produced .
if Do not configure the JDEV_USER_HOME , go to :/jdevbin directory and run jdeveloper.ext directly, all is OK now.

2) Right click on the project –> Project Properties –> Business Components –> Click OK.
Now you should be able to create the Entity Object.