Make cancel comments mandatory on a change request/order

Summary:

whenever a change status is moved to cancel, comments must be entered mandatorily

Content (required):

currently comments are not mandatory while cancelling a change. However, the requirement is to make these cancel comments mandatory on a change.

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

21D

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

Not Applicable