Joined: 23 Nov 2006 Posts: 19270 Location: Inside the Matrix
Why do you believe this is a db2 question?
A copybook is a copybook. . .
If a change was made "in the middle", everything that uses the copybook will need to be recompiled - and the data may need to be adjusted. If something new was added at the "end", only code using the addition(s) might need to be recompiled.