How to check for all lines in Order CLOSED to fetch Contract ID

Hello,

I have a scenario where for an Order if all lines gets CLOSED then the Contract ID should be fetched based on the request ID passed:

But as per the below query the query is getting fetched even some of the service lines are not CLOSED

   SELECT                                  

               DISTINCT okl.dnz_chr_id header_id

          FROM apps.OKC_K_HEADERS_ALL_B okc, apps.OKC_K_LINES_B okl

         WHERE                         

              okl  .request_id = :p_request_id

              AND  okc.id = okl.dnz_chr_id

               AND okl.STS_CODE IN ('SIGNED', 'ACTIVE')

               AND okl.dnz_chr_id IN

                      (SELECT contract_id

                         FROM apps.oks_reprocessing