Applying changes to the item definition in events is not supported. For example, changes applied to the TextBox definitions will not be applied:
textBox33.Value = report.Parent.Report.Parameters[
In events it is allowed to modify only the processing item. Examples of modifying processing items are provided in the following articles:
Changes on items in report events are not applied
I recommend passing the values to subreport parameters at design-time - when configuring the ReportSource property of the SubReport item in report designer. More details are available in Passing Parameters to a SubReport
I hope this information will help to resolve the issue.
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