Unable to delete Org Admin from Organization

Document ID : KB000103463
Last Modified Date : 31/07/2018
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Why is Portal Administrator not able to delete Org Admin for a specific Organization?
It is an expected behavior. If your user is the only one having the Org Admin role for specific Org., you will not be able to delete the user, before assuring that at least one more user does have that specific role for that organization.