diff --git a/module/sources/check_redfish/config.py b/module/sources/check_redfish/config.py
index 24d6953..c9550fe 100644
--- a/module/sources/check_redfish/config.py
+++ b/module/sources/check_redfish/config.py
@@ -30,11 +30,7 @@ class CheckRedfishConfig(ConfigBase):
         self.options = [
             ConfigOption(**config_option_enabled_definition),
 
-            ConfigOption("type",
-                         str,
-                         description="type of source. This defines which source handler to use",
-                         config_example="check_redfish",
-                         mandatory=True),
+            ConfigOption(**{**config_option_type_definition, "config_example": "check_redfish"}),
 
             ConfigOption("inventory_file_path",
                          str,
@@ -74,19 +70,7 @@ class CheckRedfishConfig(ConfigBase):
                          via check_redfish if False only data which is not preset in NetBox will be added""",
                          default_value=True),
 
-            ConfigOption("ip_tenant_inheritance_order",
-                         str,
-                         description="""\
-                         define in which order the IP address tenant will be assigned if tenant is undefined.
-                         possible values:
-                           * device : host or VM tenant will be assigned to the IP address
-                           * prefix : if the IP address belongs to an existing prefix and this prefix has a tenant assigned, then this one is used
-                           * disabled : no tenant assignment to the IP address will be performed
-                         the order of the definition is important, the default is "device, prefix" which means:
-                         If the device has a tenant then this one will be used. If not, the prefix tenant will be used if defined
-                         """,
-                         default_value="device, prefix"
-                         ),
+            ConfigOption(**config_option_ip_tenant_inheritance_order_definition),
         ]
 
         super().__init__()
diff --git a/module/sources/common/conifg.py b/module/sources/common/conifg.py
index 99273d8..d42a7c9 100644
--- a/module/sources/common/conifg.py
+++ b/module/sources/common/conifg.py
@@ -7,6 +7,14 @@
 #  For a copy, see file LICENSE.txt included in this
 #  repository or visit: <https://opensource.org/licenses/MIT>.
 
+config_option_type_definition = {
+    "key": "type",
+    "value_type": str,
+    "description": "type of source. This defines which source handler to use",
+    "config_example": "UNDEFINED",
+    "mandatory": True
+}
+
 config_option_enabled_definition = {
     "key": "enabled",
     "value_type": bool,
@@ -23,3 +31,18 @@ config_option_permitted_subnets_definition = {
     """,
     "config_example": "172.16.0.0/12, 10.0.0.0/8, 192.168.0.0/16, fd00::/8, !10.23.42.0/24"
 }
+
+config_option_ip_tenant_inheritance_order_definition = {
+    "key": "ip_tenant_inheritance_order",
+    "value_type": str,
+    "description": """\
+    define in which order the IP address tenant will be assigned if tenant is undefined.
+    possible values:
+      * device : host or VM tenant will be assigned to the IP address
+      * prefix : if the IP address belongs to an existing prefix and this prefix has a tenant assigned, then this one is used
+      * disabled : no tenant assignment to the IP address will be performed
+    the order of the definition is important, the default is "device, prefix" which means:
+    If the device has a tenant then this one will be used. If not, the prefix tenant will be used if defined
+    """,
+    "default_value": "device, prefix"
+}
\ No newline at end of file
diff --git a/module/sources/vmware/config.py b/module/sources/vmware/config.py
index 264d004..699c633 100644
--- a/module/sources/vmware/config.py
+++ b/module/sources/vmware/config.py
@@ -32,11 +32,7 @@ class VMWareConfig(ConfigBase):
         self.options = [
             ConfigOption(**config_option_enabled_definition),
 
-            ConfigOption("type",
-                         str,
-                         description="type of source. This defines which source handler to use",
-                         config_example="vmware",
-                         mandatory=True),
+            ConfigOption(**{**config_option_type_definition, "config_example": "vmware"}),
 
             ConfigOption("host_fqdn",
                          str,
@@ -317,19 +313,7 @@ class VMWareConfig(ConfigBase):
                          description="""set a matching value for ESXi host management interface description
                          (case insensitive, comma separated). Used to figure out the ESXi primary IP address""",
                          default_value="management, mgmt"),
-            ConfigOption("ip_tenant_inheritance_order",
-                         str,
-                         description="""\
-                         define in which order the IP address tenant will be assigned if tenant is undefined.
-                         possible values:
-                           * device : host or VM tenant will be assigned to the IP address
-                           * prefix : if the IP address belongs to an existing prefix and this prefix has a tenant assigned, then this one is used
-                           * disabled : no tenant assignment to the IP address will be performed
-                         the order of the definition is important, the default is "device, prefix" which means:
-                         If the device has a tenant then this one will be used. If not, the prefix tenant will be used if defined
-                         """,
-                         default_value="device, prefix"
-                         ),
+            ConfigOption(**config_option_ip_tenant_inheritance_order_definition),
             ConfigOption("sync_vm_interface_mtu",
                          bool,
                          description="""Usually netbox-sync grabs the MTU size for the VM interface from the