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It's not currently possible to use any custom functionality added to the report's requestpage (by reportextension object) in requestpagehandler. It makes really difficult to properly test such functionality using AL tests...
STATUS DETAILS
Needs Votes

Business Central Team (administrator)
Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future.
Best regards,
Business Central Team