Requisition approval rules in UI routing serial not observed in header stages

Summary:

We have 4 approval stages: preapproval, header hierarchy, header hierarchy 2 and postapproal. All 4 are set to routing 'serial'. However, when launching the approvals the assignment is done as follows: 1. preapproval 2. header hierarchy and header hierarchy 2 3. postapproval. The approval requests in step 2 are sent at the same time, but this is not true 'serial'. We want the approver in header hierarchy to respond first before the approver in header hierarchy 2 gets an approval request.

Content (please ensure you mask any confidential information):

Manage Requisition Approvals in UI. Routing 'Serial'

Version (include the version you are using, if applicable):

Oracle Fusion Cloud Applications25A