Unable to set a default value for the Accrue At Receipt flag on the Redwood Page for Purchase Order.

When creating a new form rule on the Redwood Purchase Order Edit page, I see options to make a field Required, Hidden, or Read-Only. However, I’m trying to set the Accrue At Receipt flag to Yes based on certain categories.

While I am able to add the condition based on category, I don’t see any option to set or default the value of a field on the page.

Am I missing something in my understanding, or does Oracle currently not support setting default field values through form rules for this particular page?