How to disable Custom Code in Blackout Phase for Upgrade to R12?
                    
Dear all,
                In the Checklist for Process Manufacturing Migration from Release 11.5.10 to R12.1 or Higher,
> 3. Blackout phase – Prior To Upgrade Patch Installation
> 3.1 Disable any and all custom code and or triggers before migration.
Please can you explain this step! Where and how it should be accomplished?
I appreciate a quick reply.
Thank You,
Christine
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