When I ran the upgrade utility YAPYMDLCHG it didn't work and gave the following error
Object Y2SYVENG in library QSYS not found.
As I have restored Y2SYVENG into Y2SY and Y2SY was in the library list hence I shouldn't get the above error.
What do I do?
CA 2E version 8.7 and higher
As you have merged Y2SYVENG into Y2SY, then you need to update *DTAARA YLNGENGSYA to Y2SY.
After that your YAPYMDLCHG should be fine.