When a model and manufacturer is updated; it does not reflect the new change to the CI that has reference to that model and manufacture
The behavior of not updating the Manufacturer of a Configuration Item, even when its Model has had its Company updated, has been in Service Desk/CMDB for all releases. From the investigation, this current behavior serves two purposes:
1. It allows you to see who the original Manufacturer for a Configuration Item was. It may be that this information is more relevant to users than to have a Configuration Item's Manufacturer updated to a new Company later.
2. It facilitates both users that wish to preserve the original Manufacturer of the Configuration Item via the current behavior AND it facilitates users who would like to utilize the updated Manufacturer by allowing them to reattach the Model to the Configuration Item and have the Manufacturer updated.