When you change, add, and delete fields with the Change Physical
File (CHGPF) command, a certain relationship exists between the
physical and logical files that share the same record format.
- When you change the length of a field in a physical file, you also change
the length of the logical file's field.
- When you add a field to the physical file, the field is also added to
the logical file.
- When you delete a field in the physical file, the field is also deleted
from the logical file unless there is another dependency in DDS, such as a
keyed field or a select/omit statement.