Getting the error "An interface with rule inputs cannot be saved as a report" when adding interface to report
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As Naresh indicated... you need to select an interface with no rule inputs. The point here is that a reporting interface will always load without any further context, hence no parameters. A simple solution if you need to expose an existing interface as-is, is to create a new interface (with no rule inputs) and call the existing interface from it, hardcoding or otherwise pre-setting its input values.