Error "API-1005" in Allocations Timeline using custom attribute for Resource object

Products

• Clarity PPM SaaS
• Clarity PPM On Premise

Issue/Introduction

The Allocations Timeline view is failing to load with API-1005 error when using a custom attribute for the Resource object.

Steps to Reproduce:

1. In Classic UI, on Studio, create a custom attribute on the Resource object.
   ie: z_test
2. Make sure the attribute is available in Modern UX by setting its API ATTRIBUTE ID
3. On Modern UI, select Staffing -> Allocations Timeline.
4. Select Allocations by Resource.
5. Add a new filter or add a column using the newly created attribute for the Resource object.

Expected Results: The Allocations by Resource to reload, applying the filter and/or displaying the new column added.
Actual Results: The view is failing to load, with error:
API-1005 : Attribute(s) 'resources____z_test' specified in query parameters are not supported or secured.

Environment

Release : 16.1.1

Cause

DE68802

Resolution

Resolved in 16.1.2

Fixed as from version 16.1.1.1485

Workaround: Remove the resource custom attribute from the view (filters and/or columns).