You can only change a processing method under the following conditions:
If the project enforces method approval, the method status must be Generic. For details, see Method approval.
The method is writable. Read-only methods are marked with a
read-only symbol
in the navigation pane.
Methods are read-only, for example, if they have been archived in Content Management, or if they are loaded into another project.
To change a read-only method, save it under a new file name first. The new file is then writable.