Unable to create a Modern UX subobject instance if a number type attribute is required and the field value is 0

Products

• Clarity PPM On Premise
• Clarity PPM SaaS

Issue/Introduction

STEPS TO REPRODUCE: 

1. Go to Administration > Studio > Objects
2. Create a subobject of the project object.
3. Make it API Enabled
3. On the attribute list, create a Number Type attribute and mark it as VALUE REQUIRED. And provide an API attribute ID
4. Go to the Modern UX
5. Edit a project Blueprint and under Modules, add the subobject created in Step2 and Publish it
6. Edit a project associated to the Blueprint we modified 
7. Go to the subobject tab and add the Number Type attribute we created to the list.
8. Click on the + sign and create a new instance.
9. Fill the fields in and add a 1 as value to the custom Number Type attribute
10. Instance is created
11. Click on the + sign and create a new instance.
12. Fill the fields in and add a 0 as value to the custom Number Type attribute

Expected Results: The new instance is created successfully.
Actual Results: The new instance is not created. The number 0 is not accepted at creation

Cause

This is caused by DE54578

Environment

Clarity PPM 15.7, 15.7.1 and 15.8

Resolution

This is fixed in 15.8.1

Workaround for releases prior to 15.8.1: Add a non 0 value at creation and then update it to 0