/span><span class='op'>)</span>
</div><div class='output co'>#&gt; [1] FALSE
#&gt; attr(,"msg")
#&gt; [1] "Patients with more than one study discontinuation records. "
#&gt; attr(,"data")
#&gt;   USUBJID                DSSCAT
#&gt; 1       3 STUDY DISCONTINUATION
#&gt; 2       3 STUDY DISCONTINUATION</div><div class='input'>
<span class='va'>DS</span><span class='op'>$</span><span class='va'>DSSCAT</span> <span class='op'>=</span> <span class='cn'>NULL</span>
<span class='fu'>check_ds_dsscat</span><span cla