Timestamp Mismatch message

Q:

Why am I receiving a Timestamp Mismatch message and how do I resolve it?

A:

A Timestamp Mismatch indicates the program stored on the Track Source File is not the program executing in CICS.
 
Enter P=yourpgmname on a Track command line and look for the date near offset 60. Compare this to the date from Options 1.2 and 2.2.
 
Either

1. You need to NEWCOPY your program, or
2. An older version of the same program is in a library higher in the RPL (or Phase) list.