Fetch Previous month Measure Output

Summary:

Looking for a custom function to fetch the previous month's measure output.

Content (please ensure you mask any confidential information):

With the predefined custom function 'Previous Interval Attainment' in place, does it work when I copy a plan from 2024 to 2025?

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

25A

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