Added a note about data transformers not being applied with inherit_data option set

Author: javiereguiluz

cookbook/form/data_transformers.rst

@@ -17,6 +17,11 @@ You could try to do this in your controller, but it's not the best solution.
 It would be better if this issue were automatically converted to an Issue object.
 This is where Data Transformers come into play.
 
+.. caution::
+
+    When a field has the :doc:`inherit_data </reference/forms/types/options/inherit_data.rst.inc>`
+    option set, Data Transformers won't be applied to that field.
+
 Creating the Transformer
 ------------------------
 

reference/forms/types/options/inherit_data.rst.inc

@@ -10,3 +10,9 @@ inherit_data
 This option determines if the form will inherit data from its parent form.
 This can be useful if you have a set of fields that are duplicated across
 multiple forms. See :doc:`/cookbook/form/inherit_data_option`.
+
+.. caution::
+
+    When a field has the ``inherit_data`` option set, it uses the data of the
+    parent form as is. This means that :doc:`Data Transformers </cookbook/form/data_transformers>`
+    won't be applied to that field.