Earlier (pre-9.0) versions of ATG Content Administration support deployment from child branches of the versioning system. If you used these versions of ATG Content Administration, it is likely that your versioning system retains a number of asset versions from child branches that were created for earlier projects.

The PurgingService property preciseSummaryReports determines whether a summary metrics report takes into account all branch asset versions when it calculates the number of asset versions to be purged. By default, this property is set to false. Given this setting, when the purging service generates the pre-purge summary report, it ignores asset versions on the main branch that have derived assets on child branches. By doing so, pre-purge summary report statistics are liable to differ slightly from actual purge results. Setting this property to true guarantees precision in pre-purge calculations; however, it can dramatically increase the overhead incurred by report generation.