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Need help to write merge trigger


I'm haveing requriment like : There are two accounts A1 and A2,A1 having one open opportunity and A2 having one open opportunity when I try to merge A1 and A2 error should throws


for this i need to write trigger to merge account with conditions with custom button.


Merge operation performs both update and delete operations.

Only way you can do is to write a trigger on delete operation and check for field 'MasterRecordId', which will contain the winner record Id. This field will be populated only if record is deleted out of merge operation.