How can we restrict Auto complete rules to a single transaction like change salary when and why?

Summary:

I have to restrict when and why section date to current date for change salary transaction. which means all other transaction like change assignment can be performed back dated.

Content (required):

I am able to restrict in when and why but it is globally applied to all other transactions.

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

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