diff --git a/product.py b/product.py
index 51412c4..8c4da01 100644
--- a/product.py
+++ b/product.py
@@ -97,7 +97,9 @@ class Template(metaclass=PoolMeta):
     origin_country = fields.Many2One('country.country',"Origin Country")
     refurbish = fields.Boolean('Refurbish')
     software_required = fields.Boolean("Software Required")
-    software_version = fields.Char("Software version", states={'invisible': If(Eval('software_required'), True)})
+    software_version = fields.Char("Software version",
+                                   states={'invisible': If(~Eval('software_required'), True)},
+                                   depends=['software_required'])
 
     #These are measurements required for the equipments, are in this place
     # for manage of class 'product.template'
@@ -284,7 +286,11 @@ class Template(metaclass=PoolMeta):
     def default_refurbish():
         return False
 
-
+    @fields.depends('software_required', 'software_version')
+    def on_change_sotfware_required(self):
+        if self.software_required:
+            self.software_version = None
+    
     @fields.depends('d_resolution', 'analog_resolution', 'a_factor_resolution')
     def on_change_resolution_type(self):
         self.d_resolution = None
@@ -298,7 +304,7 @@ class Template(metaclass=PoolMeta):
             self.replacement=False
             self.maintenance_activity=False
             self.calibration=False
-
+       
     @fields.depends('mark_category', 'model_category', 'reference_category')
     def on_change_mark_category(self):
         if not self.mark_category: