Autocomplete - how t0 default value in DFF from Request a New Position Effective Start Date

Summary:

We have DFF from Position Details name "Position Start Date" and we want to auto-populate this based on the value of Effective Start Date from the When and Why section of the action, 'Request a New Position'.

Content (please ensure you mask any confidential information):

Currently, on our Autocomplete rule from Business Object 'Position', even if we specifically point the value of the DFF Attribute from Effective Start Date, it still does not work for those future and back dated dates. And it only display "Today's()" Date. We want the DFF to have values on whatever date entered from the Effective Start Date of the When and Why section. Please can you advise? Below is straightforward snip of the rule.