MemberAdminWindow: Allow user to keep AreaCom YearTo when transfering

Elwig/Services/MemberService.cs

@@ -597,7 +597,7 @@ namespace Elwig.Services {
                     KgNr = c.KgNr,
                     GstNr = c.GstNr,
                     RdNr = c.RdNr,
-                    YearFrom = year,
+                    YearFrom = vm.MaintainAreaComYearTo ? c.YearFrom : year,
                     YearTo = c.YearTo,
                 }));