One unfortunate difference between SMP 7.1 and 7.5 is that in 7.1, when you run a report, the SMP records a number of "Altiris.Reporting....." entries in its logs; two of which were high useful:
Source: Altiris.Reporting.DataSource.ResourceDataSource.Run Description: ResourceDataSource returned N rows in 'Table' table
N equates to the number of rows that you report displayed, making it easy to locate the write log records, because immediately below this line will be the actual reports SQL that was used:
Source: Altiris.Reporting.DataSource.ResourceDataSource.Run Description: ResourceDataSource is running query:
<Reports SQL starts here>