Restriction in promotion that employee should be promoted to new grade of 1 level up only

Summary:

How we can set up the workforce compensation plan in such a way that the manager should be able to enter a 'New grade' of 1 level up of current grade only?

Content (required):

Hi,

We have a requirement where in salary increase compensation plan manager can promote their employees to new grades.

We need to have a validation that the new grade of the employee should be 1 level up to the employee's current grade.

Is there any way to do it?

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

20D

Code Snippet (add any code snippets that support your topic, if applicable):