I double checked, and we don't currently have any errata published for that title. It would otherwise appear on the books page here at sybex.com or on wiley.com.
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Are asking about the following:
Q5) is asking about “not be appropriate” while the answer
explanation in page 322 situation 2 is not appropriate while Situation 1,3 and
4 are okay. So the solution should be something else
Q6) is asking about “can be used” while in the answer explanation
all can be used except 3 Staff rosters while the answer is something else.