With R12.2 you now have two file systems (fs): Run and Patch. Both actually being self explanatory. The run fs is where the current instance is being run from ($RUN_BASE) and patch fs is what adop uses to apply patches to before cutting over to use as the run fs ($PATCH_BASE).
So one of the issues possibly for developers is that upon opening a ssh session they will need to source the run files system or even for DBA work you normally use the run fs unless specific work is needed on the patch fs. So how too make it easier than sourcing EBSapps.env each time and then entering either Run or Patch.
This is what is needed:
source /u01/oracle/EBSapps.env run
Now you could call this ever time you log into the instance or you could add it to $HOME/.bash_profile
This way you will not have to worry about it and the person logging in will be using the run fs where most work is needed.
How To Automatically Set the Current Run or Patch Edition / File System for EBS 12.2 (Doc ID 1545584.1)