Have you enabled Public Sector module?
if so, then on the specific Purchase Requisition on the Financial Action pane click button Reserve budget funds. This should bring your PR to Release approve PRs form
With Public Sector enabled, even if you are not using Budget Control, you must run both the workflow processing jobs and the Empty Batch Group all on the same AOS. (It seems that the budget check process uses the Empty Batch Group, So, if the workflow jobs and the Empty Batch Group are on different AOS’s, the workflow process might finish before the budget check is done. When the workflow is finished before the budget check, then the check mark is not there.)