Promote Approval based on Grade Step

Summary:

I need to configure the promotion approval based on the proposed grade step of an employee. For example, if the proposed grade step is between 1 and 4, it should be routed to approver X. I found the attribute for Grade Step but when I use it, the value is being passed as null.

Content (please ensure you mask any confidential information):

This is the If Condition I tried but it doesn't work:

(((Worker's Current Assignment.result.Job Level == 1) OR (Worker's Current Assignment.result.Job Level == null)) AND (Worker's Proposed Assignment.result.Grade Step between "5" and "9"))

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