Assume that you have finished your substantive analytical procedures in the area of revenue. You used trend analysis and a reasonableness test and conducted the procedures at a disaggregated level. You are very pleased that your expectations are almost identical to what the client has recorded. Specifically, revenue increased in line with prior period increases and with the industry increases. You let your senior know that you likely do not have any additional work to perform. Your senior asks you to reconsider your conclusion. What is likely the primary concern of your senior?