diff --git a/secop/modules.py b/secop/modules.py
index 6e89030..8df582e 100644
--- a/secop/modules.py
+++ b/secop/modules.py
@@ -89,16 +89,17 @@ class HasAccessibles(HasProperties):
             if isinstance(pobj, Command):
                 # nothing to do for now
                 continue
-            rfunc = cls.__dict__.get('read_' + pname, None)
+            rfunc = getattr(cls, 'read_' + pname, None)
             rfunc_handler = pobj.handler.get_read_func(cls, pname) if pobj.handler else None
+            not_wrapped = getattr(rfunc, '__wrapped__', False) is False
             if rfunc_handler:
-                if rfunc:
+                if rfunc and not_wrapped:
                     raise ProgrammingError("parameter '%s' can not have a handler "
                                            "and read_%s" % (pname, pname))
                 rfunc = rfunc_handler
 
             # create wrapper except when read function is already wrapped
-            if rfunc is None or getattr(rfunc, '__wrapped__', False) is False:
+            if rfunc is None or not_wrapped:
 
                 def wrapped_rfunc(self, pname=pname, rfunc=rfunc):
                     if rfunc:
@@ -126,11 +127,12 @@ class HasAccessibles(HasProperties):
 
             if not pobj.readonly:
                 wfunc = getattr(cls, 'write_' + pname, None)
-                if wfunc is None:  # ignore the handler, if a write function is present
+                not_wrapped = getattr(wfunc, '__wrapped__', False) is False
+                if wfunc is None or not_wrapped:  # ignore the handler, if a write function is present
                     wfunc = pobj.handler.get_write_func(pname) if pobj.handler else None
 
                 # create wrapper except when write function is already wrapped
-                if wfunc is None or getattr(wfunc, '__wrapped__', False) is False:
+                if wfunc is None or not_wrapped:
 
                     def wrapped_wfunc(self, value, pname=pname, wfunc=wfunc):
                         self.log.debug("check validity of %s = %r" % (pname, value))
diff --git a/secop/proxy.py b/secop/proxy.py
index 7320e82..325091c 100644
--- a/secop/proxy.py
+++ b/secop/proxy.py
@@ -122,6 +122,8 @@ class ProxyModule(HasIodev, Module):
                     self.announceUpdate(pname, None, readerror)
                 self.announceUpdate('status', newstatus)
 
+    def checkProperties(self):
+        pass # skip
 
 class ProxyReadable(ProxyModule, Readable):
     pass