diff --git a/doc/topics/views/index.rst b/doc/topics/views/index.rst
index 424c5328f0..764b7c9868 100644
--- a/doc/topics/views/index.rst
+++ b/doc/topics/views/index.rst
@@ -349,6 +349,8 @@ Create a sub-table in a cell.
 
     * ``col``: The number of columns for the group contains.
 
+    * ``homogeneous``: If True all the tables cells are the same size.
+
     * ``id``: see in common-attributes-id_.
 
     * ``yexpand``: see in common-attributes-yexpand_.
diff --git a/trytond/ir/ui/form.rnc b/trytond/ir/ui/form.rnc
index b7cd2ce0f0..eeff307e96 100644
--- a/trytond/ir/ui/form.rnc
+++ b/trytond/ir/ui/form.rnc
@@ -192,6 +192,7 @@ attlist.group &= [ a:defaultValue = "1" ] attribute rowspan { text }?
 attlist.group &= [ a:defaultValue = "4" ] attribute col { text }?
 attlist.group &= ( attribute name { text } | attribute id { text } )
 attlist.group &= attribute states { text }?
+attlist.group &= [ a:defaultValue = "0" ] attribute homogeneous { "0" | "1" }?
 
 hpaned = element hpaned { attlist.paned, child* }
 
diff --git a/trytond/ir/ui/form.rng b/trytond/ir/ui/form.rng
index 35bfe4ed05..52149e232b 100644
--- a/trytond/ir/ui/form.rng
+++ b/trytond/ir/ui/form.rng
@@ -721,6 +721,16 @@
       <attribute name="states"/>
     </optional>
   </define>
+  <define name="attlist.group" combine="interleave">
+    <optional>
+      <attribute name="homogeneous" a:defaultValue="0">
+        <choice>
+          <value>0</value>
+          <value>1</value>
+        </choice>
+      </attribute>
+    </optional>
+  </define>
   <define name="hpaned">
     <element name="hpaned">
       <ref name="attlist.paned"/>