Comment 2 for bug 1845050

A WIP patch is available for testing in the user/gmcharlt/nested_reports_includes branch in the working repository.

As near as I can tell, something subtly changed in how Apache handles filters or filtering of subrequests. Since mod_xmlent maintains a shared XML parser per Apache backend and the oils_rpt* interface uses both mod_include and mod_xmlent, parsing fragments out of order in the course of handling a sub-request generated by mod_include would account for the error seen. However, it's not immediately clear to me why this wasn't an issue before.