(or otherwise stated in their queries as: Reports![srptFixtureSchedule_text].[txtType]
The parameters/criteria to pull selective data from table(s) should be passed using forms and not report.
when I create a BLANK new report: rptFixtureSchedule_shell with srptFixtureSchedule_text as an UNBOUND subreport
Typically, some fields in report may be unbound and values assigned dynamically but generally, reports are based on some query or table.
The parameter pops up because the report rptFixtureSchedule_text is inside the report rptFixtureSchedule_shell.
Try
Code:
Reports!rptFixtureSchedule_shell!srptFixtureSchedule_text.Report.txtType
In this case the, syntax to refer to the control on sub-report will be different. See more for syntax http://access.mvps.org/access/forms/frm0031.htm
The link refers to sub-forms.