Fixed conversion enabled logic.

client/src/components/job-tombstone/job-tombstone.component.jsx

@@ -75,7 +75,9 @@ function JobTombstone({ job, ...otherProps }) {
   const tombstoneTitle = (
     <div>
       <Avatar size='large' alt='Vehicle Image' src={CarImage} />
-      {t("jobs.fields.ro_number") + " " + jobContext.ro_number ?? "0"}
+      {`${t("jobs.fields.ro_number")} ${
+        jobContext.ro_number ? jobContext.ro_number : t("general.labels.na")
+      }`}
     </div>
   );
 
@@ -99,7 +101,7 @@ function JobTombstone({ job, ...otherProps }) {
             <Button
               key='convert'
               type='dashed'
-              disabled={!jobContext.converted}
+              disabled={jobContext.converted}
               onClick={() => {
                 mutationConvertJob({
                   variables: { jobId: jobContext.id }