Customers sometimes report occurrences of the following type of message being issued to users who are running audit:

CMN2622I - I/A table out of date. Cannot find BUN for library type {libtype} in application {appl}. This may result in invalid synchs.

The cause of and resolution to this message is documented in the ZMF Messages Guide, the 8.2 Patch 7 version of which can be found here. 

A general rule-of-thumb is that the ZMF Impact Analysis (I/A) table needs to be synchronized whenever changes are made to baseline library definitions in ZMF ISPF Option A.A.B. To synchronize the I/A table, the distributed IMPACT and LDSLOAD jobs must be executed. If unsure whether or not synchronization is required after making a change to baseline library definitions it is best to err on the side of caution and run these jobs.

Although not strictly necessary if IMPACT and LDSLOAD are always run after every change to baseline library definitions, it may be beneficial for customers to also consider running these jobs on a regular basis. For example, as a part of their weekly housekeeping suites. This will not only ensure that these jobs are up-to-date and capable of being run when absolutely required, but will also automatically catch any minor changes made to baseline definitions that have been missed or forgotten since the last I/A synchronization.