Apex heap size too large error when merging Cases


During the Merge, this error is usually seen due to a large number of Email Messages on the Cases and the included large sized attachments.


Please enable the "Object Cloning Selection" option in the Setup Wizard:

object cloning selection.jpg

Next, deselect "Email Messages" from the merge action being performed at that time:

To have it always deselected, under the Setup Wizard, deselect Email Messages from the Child Objects to be cloned:



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