CA API Management: How to edit the OAuth custom field once integrated with Developer Portal 3.x

Document ID : KB000093261
Last Modified Date : 27/04/2018
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How can the OAuth client 'custom' field be edited once the OTK has been integrated with CA Developer Portal 3.x?
This is not currently possible. Once integrating with CA Developer portal you will lost the ability to make changes to the Client custom field.
Attempts to workaround this using the clientstore API will also fail. 
Additional Information:
The OTK client 'custom' field was introduced in OTK-3.3.01 (January 2016) release.