diff --git a/src/mlpro/bf/math/properties.py b/src/mlpro/bf/math/properties.py
index 683f86fc3..6e808737d 100644
--- a/src/mlpro/bf/math/properties.py
+++ b/src/mlpro/bf/math/properties.py
@@ -32,10 +32,11 @@
 ## -- 2024-06-03  1.0.1     DA       Method Properties.update_plot(): changed order of plotting
 ## -- 2024-06-05  1.1.0     DA       New method Properties.replace_property()
 ## -- 2024-06-06  1.2.0     DA       New custom method Properties._update_property_links()
+## -- 2024-06-16  1.3.0     DA       New method Properties.get_property_definitions()
 ## -------------------------------------------------------------------------------------------------
 
 """
-Ver. 1.2.0 (2024-06-06)
+Ver. 1.3.0 (2024-06-16)
 
 This module provides a systematics for enriched managed properties. MLPro's enriched properties
 store any data like class attributes and they can be used like class attributes. They extend the
@@ -272,6 +273,7 @@ def __init__( self,
                   p_visualize : bool = False ):
                      
         self._properties = {}
+        self._property_definitions = {}
         self.add_properties( p_property_definitions = self.C_PROPERTIES, p_visualize = p_visualize )
         self.add_properties( p_property_definitions = p_properties, p_visualize = p_visualize )
         self._update_property_links()
@@ -310,6 +312,7 @@ def add_property( self,
                           p_value_prev = p_value_prev,
                           p_visualize = p_visualize )
         self._properties[p_name] = (prop_obj, False)
+        self._property_definitions[p_name] = ( p_name, p_derivative_order_max, p_value_prev, p_cls )
         setattr(self, p_name, prop_obj )
 
 
@@ -348,6 +351,20 @@ def get_properties(self):
         """
 
         return self._properties
+
+
+## -------------------------------------------------------------------------------------------------
+    def get_property_definitions(self) -> PropertyDefinitions:
+        """
+        Returns a list of currently stored property definitions.
+
+        Returns
+        -------
+        PropertyDefinitions
+            List of property definitions
+        """
+
+        return list(self._property_definitions.values())
     
 
 ## -------------------------------------------------------------------------------------------------
diff --git a/src/mlpro/oa/streams/tasks/clusteranalyzers/basics.py b/src/mlpro/oa/streams/tasks/clusteranalyzers/basics.py
index c3267e120..1fda8b9a5 100644
--- a/src/mlpro/oa/streams/tasks/clusteranalyzers/basics.py
+++ b/src/mlpro/oa/streams/tasks/clusteranalyzers/basics.py
@@ -35,10 +35,11 @@
 ## --                                - renamed attributes C_MS_SCOPE_* to C_RESULT_SCOPE_*
 ## --                                - new method _get_cluster_relations()
 ## --                                - new method get_cluster_influences()
+## -- 2024-06-16  1.2.1     DA       Bugfix in ClusterAnalyzer.align_cluster_properties()
 ## -------------------------------------------------------------------------------------------------
 
 """
-Ver. 1.2.0 (2024-06-08)
+Ver. 1.2.1 (2024-06-16)
 
 This module provides a template class for online cluster analysis.
 """
@@ -72,7 +73,7 @@ class ClusterAnalyzer (OATask):
     - Specify all cluster properties provided/maintained by your algorithm in C_CLUSTER_PROPERTIES.
     - Implement method self._adapt() to update your cluster list on new instances
     - Implement method self._adapt_reverse() to update your cluster list on obsolete instances
-    - New cluster: hand over self._cluster_properties on instantiation
+    - New cluster: hand over self._cluster_properties.values() on instantiation
     
     Parameters
     ----------
@@ -149,10 +150,9 @@ def __init__( self,
         self._cluster_limit = p_cluster_limit
         self._next_cluster_id : ClusterId = -1
 
-        self._cluster_properties : PropertyDefinitions = self.C_CLUSTER_PROPERTIES.copy()
-        self._cluster_properties_dict = {}
-        for prop in self._cluster_properties:
-            self._cluster_properties_dict[prop[0]] = prop
+        self._cluster_properties = {}
+        for prop in self.C_CLUSTER_PROPERTIES:
+            self._cluster_properties[prop[0]] = prop
 
 
 ## -------------------------------------------------------------------------------------------------
@@ -175,9 +175,10 @@ def align_cluster_properties( self, p_properties : PropertyDefinitions ) -> list
 
         for p_ext in p_properties:
             try:
-                p_int = self._cluster_properties_dict[p_ext[0]]
+                p_int = self._cluster_properties[p_ext[0]]
                 p_int[1] = p_ext[1]   # alignment of maximum order of derivatives
-                p_int[2] = p_ext[2]   # alignment of property class
+                p_int[2] = p_ext[2]   # alignment of storage of previous values
+                p_int[3] = p_ext[3]   # alignment of property class
             except:
                 # Property not supported by cluster algorithm
                 unknown_properties.append(p_ext[0])
@@ -316,6 +317,7 @@ def _get_cluster_relations( self,
 
         if cluster_max_results is not None:
             list_results_abs.append( cluster_max_results )            
+            sum_results = cluster_max_results[1]
 
 
         # 2 Determination of relative result values according to the required scope