Redwood Grade Ladder Error ActionOccurenceID

Summary:

ActionOccurenceID error when adding a grade and rates onto a grade ladder.

Content (please ensure you mask any confidential information):

I am trying to add a grade onto a grade ladder in Redwood pages and I receive an error of:

Provide a valid value for ActionOccurrenceId.

What is the ActionOccurenceID and how do would one add it when there is not a ActionOccurrence in the list of fields available?

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

25C