can now register in one boat class/type with M/F and mixed

rowers/views.py

@@ -13888,14 +13888,25 @@ def virtualevent_addboat_view(request,id=0):
                 sex = 'male'
             
             if boattype in boattypes and boatclass in boatclasses:
-                messages.error(request,"You have already registered in that boat class/type")
-                url = reverse(virtualevent_view,
-                              kwargs = {
-                                  'id': race.id
+                # check if different sexes
+                therecords = records.filter(
+                    boattype=boattype,
+                    boatclass=boatclass)
+
+                thesexes = [record.sex for record in therecords]
+                if sex in thesexes:
+                
+                    messages.error(
+                        request,
+                        "You have already registered in that boat class/type"
+                    )
+                    url = reverse(virtualevent_view,
+                                  kwargs = {
+                                      'id': race.id
                                   }
                               )
 
-                return HttpResponseRedirect(url)
+                    return HttpResponseRedirect(url)
 
             record = VirtualRaceResult(
                 userid=r.id,