Problem:

Copy book flagged as missing is obsolete and is no longer used.

How to correct the error?

Resolution:

If the program calling the copy book is truly obsolete, it can be deleted from the project.  

If not, the "Copybook Not Found" status is a serious problem with missing source code that

Revolve has discovered.  

Need to determine why it's considered obsolete if a program is calling for it in it's code.  

Copybooks are only ever "searched for" if they are used in specific code that is added to the project.