Once an asset is added and saved, which fields can later be edited?

You can edit almost all of the 276 standard fields and the unlimited number of user-defined fields in an asset record after it has been established. The exceptions include the asset/item number, user-entry info (such as user ID, date, type of entry), and amount posted current period.

If the asset has been disposed of by means of a system-generated Fixed Assets posting, you cannot edit the fields on the G/L Book Info tab, Other Books Info subtask, and Disp Info tab of the Asset Master record. (Although you can access these tabs/subtask for purposes of inquiry and you are able to change values in the fields, you cannot save your changes when you exit the tabs/subtask.)