# Error Conditions for Merged Policies

Most errors, such as mismatched interface types while merging attachments, are caught during configuration. If merging fails, the attachment at the given interface is not modified.

You can modify component policies manually. Although you might want to do this for debugging purposes, we highly discourage you doing this because it can affect synchronization with the Service Manager application. You cannot manually attach a final merged policy to any interfaces. Instead, attach the set of component policies that constitute this merged policy. If you want to modify the final merged policy, use existing policy merging or component policy modification to achieve this.