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Apex heap size too large error when merging Cases

Summary

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.

Details

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



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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