You are trying to activate a second Approval Process, but notice only one can be active at time.
SAP Cloud for Customer
You can have as many as Approval Process you want, however just one can be Active.
When you activate an Approval Process that is with Draft Status, the currently active process will be deactivated.
This is the current expected behavior of SAP Cloud for Customer.
1. If you are a partner: please use firstname.lastname@example.org or the Partnerfinder.
2. If you are a customer:
Contact your Account Executive;
Check the link https://www.sap.com/services/innovation.html#contact-us.
An alternative option may be to check the SAP Cloud for Customer Influence Site to submit an idea.
Ticket ; Opportunity ; Validity ; Draft ; Campaign ; Unlimited , KBA , LOD-CRM-SRP , Service Request Processing , How To