diff --git a/product.py b/product.py
index 38f3d3f..d46bfca 100644
--- a/product.py
+++ b/product.py
@@ -47,17 +47,35 @@ class Template(metaclass=PoolMeta):
     __name__ = 'product.template'
 
     equipment = fields.Boolean('It is equipment')
-    equipment_type = fields.Selection(_EQUIPMENT_TYPE, 'Equipment type', required=True)
+    equipment_type = fields.Selection(_EQUIPMENT_TYPE, 'Equipment type',
+                                      states={'required': Eval('equipment', False)},
+                                      depends=['equipment']
+                                      )
     risk = fields.Selection(_RISK, 'Type risk')
-    use  = fields.Selection(_USE, 'Use', required=True)
-    biomedical_class = fields.Selection(_BIOMEDICAL_CLASS,
-                                        'Biomedical Class', required=True)
-    main_tecnology = fields.Selection(_MAIN_TECNOLOGY,
-                                      'Main tecnology', required=True)
+    use  = fields.Selection(_USE, 'Use',
+                            states={'required': Eval('equipment', False)},
+                            depends=['equipment']
+                            )
+    biomedical_class = fields.Selection(_BIOMEDICAL_CLASS,'Biomedical Class',
+                                        states={'required': Eval('equipment', False)},
+                                        depends=['equipment']
+                                        )
+    main_tecnology = fields.Selection(_MAIN_TECNOLOGY,'Main tecnology',
+                            states={'required': Eval('equipment', False)},
+                            depends=['equipment']
+                                      )
     calibration = fields.Boolean("Apply calibration")
     observation = fields.Text('Observation')
-    mark_category = fields.Many2One('product.category', 'Mark')
-    model_category  = fields.Many2One('product.category', "Model")
+    mark_category = fields.Many2One('product.category', 'Mark',
+                                    domain=[('parent', '=', None)],
+                                    states={'required': Eval('equipment', False)},
+                                    depends=['equipment']
+                                    )
+    model_category  = fields.Many2One('product.category', "Model",
+                                      domain=[('parent', '=', Eval('mark_category'))],
+                                      states={'required': Eval('equipment', False)},
+                                      depends=['equipment']
+                                      )
     reference = fields.Char("Reference", size=None)
     origin_country = fields.Many2One('country.country',"Origin Country")
     software_version = fields.Char(
diff --git a/view/template_form.xml b/view/template_form.xml
index c5e7f2c..17e42f8 100644
--- a/view/template_form.xml
+++ b/view/template_form.xml
@@ -9,7 +9,8 @@ this repository contains the full copyright notices and license terms. -->
     <xpath expr="/form/notebook/page[@id='general']" position="after">
 	<page string="Features" id="features">
 	    <label name="reference"/>
-	    <field name="reference"/> 	    
+	    <field name="reference"/>
+	    <newline/>
 	    <label name="mark_category"/>
 	    <field name="mark_category"/>
 	    <label name="model_category"/>