Never use a name which is or were assigned in a base module

Because during the update, it will try (and fail) to set to his origin name

product_unit_manager_group/__openerp__.py

@@ -4,7 +4,7 @@
 {
     'name': 'Product Unit Manager Group',
     'summary': 'Add a group Product Unit of Measure Manager',
-    'version': '8.0.1.0.0',
+    'version': '8.0.1.0.1',
     'category': 'Product',
     'website': 'http://akretion.com',
     'author': 'Akretion',

product_unit_manager_group/security/product_security.xml

@@ -8,7 +8,7 @@
 </record>
 
 <record id="group_uom_manager" model="res.groups">
-    <field name="name">Manage Multiple Units of Measure</field>
+    <field name="name">Manage Multiple Units of Measure (Manager)</field>
     <field name="comment">Manage Multiple Units of Measure</field>
     <field name="category_id" ref="base.module_category_hidden"/>
     <field name="users" eval="[(4, ref('base.user_root'))]"/>