You can modify a field definition to fit your management needs. This is especially useful if you change a field caption.
Note: You may not have access to this feature, see your system administrator for details.
To change a field definition, complete the following steps:
<Ctrl>+ Right - click. The following window will appear:

to save your changes. OR
to cancel your changes and return to the default definition.
. The read-only version of the original field definition will appear. 
and then
. Your changes will be erased and the default definition will be restored.