Unable to delete entity due to a business rule restriction

Products

• CA API Developer Portal
• CA API Gateway

Issue/Introduction

User has tried to delete a user of type "Developer" with the role "Org Admin" and the API Portal shows me the error:
Unable to delete entity due to a business rule restriction What can I do? 

Environment

Portal 4.2

Resolution

As per the current design of the Portal ORG's and ORG Admins can not be deleted. 
Thus is a known design limitation that this version has and our engineering team have it on the road map of next releases to be alerted.