diff --git a/product/ERP5/PropertySheet/Resource.py b/product/ERP5/PropertySheet/Resource.py
index a891fecb4d2c8484e822db083567d84bb67c6d52..4fcf87692abdf3876c336e03cac3aff28550b8aa 100755
--- a/product/ERP5/PropertySheet/Resource.py
+++ b/product/ERP5/PropertySheet/Resource.py
@@ -79,15 +79,19 @@ class Resource:
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'base_length',
-            'description' : 'length of the resource',
+            'description' : 'A typical per unit length of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'base_width',
-            'description' : 'width of the resource',
+            'description' : 'A typical per unit width of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'base_height',
-            'description' : 'height of the resource',
+            'description' : 'A typical per unit height of the resource',
+            'type'        : 'float',
+            'mode'        : 'w' },
+        {   'id'          : 'base_surface',
+            'description' : 'A typical per unit surface of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         # Basic conversion properties
@@ -100,23 +104,27 @@ class Resource:
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'weight_quantity',
+            'description' : 'weight of the resource',
+            'type'        : 'float',
+            'mode'        : 'w' },
+        {   'id'          : 'height_quantity',
             'description' : 'height of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'surface_quantity',
-            'description' : 'height of the resource',
+            'description' : 'surface area of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'volume_quantity',
-            'description' : 'height of the resource',
+            'description' : 'volume of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'unit_quantity',
-            'description' : 'width of the resource',
+            'description' : 'units of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         {   'id'          : 'time_quantity',
-            'description' : 'width of the resource',
+            'description' : 'time of the resource',
             'type'        : 'float',
             'mode'        : 'w' },
         # Definition of the variation domain