22D feature- autocomplete rule for final close date in the termination flow

Summary:

We have a bunch of re-hires happening every other pay period and its difficult to manually end date previous elements for each employee. Hence, we are interested in using the defaulted final close date functionality so that all rehired element entry page is not convoluted with previous assignments elements.

Content (required):

Under autocomplete rules when I select 'element duration date' under business object , I m not getting any option to add rules . Please find screenshot below. Will be thankful, if anyone could guide or provide steps to populate rules so that we could set the final close day as cheque day or pay day.