I have written some approval logic on workflow based on purchase order totals that is triggering only once . Once if i edit and submit the purchase order record by changing the total it is not working .

I have my workflow on view/ update trigger point . I am expecting to trigger when there is edit and submit action works . But it is only triggering one time onclick of edit and submit button.

I want my workflow to trigger multiple times on the record when user edit and submit by changing the purchase order totals.