API Error enabling sub-object of Cost Plan

Products

• Clarity PPM SaaS
• Clarity PPM On Premise

Issue/Introduction

I am trying to API enable a sub-object of the Cost Plan object so that I can use it in the Modern UI / New User Experience and get error:

ODF-0248: Cannot API enable custom sub-object.

Cause

This is working as designed. Sub objects of cost plans are currently not available for API Enablement. 

Environment

Release : All Supported

Component : CA PPM SAAS STUDIO

Resolution

The following subobject types are available for API Enabling as referenced at: API Enable Custom Objects and Custom Investments

Custom Subobjects: You can API enable a custom subobject if it belongs to a

• Project or investment (or supported abstract objects)
• API enabled custom master object