Does anyone know how to pass parameters from a Dashboard to a channel for launch

Does anyone know how to pass parameters from a Dashboard to a channel for launch process? Also, anyone know how to pass parameters, like process ID, from a Process Report row click to launch a process, passing the process ID ? It is clear a report can open and pass one parameter to other reports and dashboards, but apparently not launch a process. If a report row click opens a dashboard, that dashboard can contain a channel to launch a process with a parameter, but I am not successful getting a parameter to pass, eht expression editor for the channel value shows process variables as possible values, but the process never validates and gives the error that process variables cannot be used in a process variable expression. Any ideas?? Can a rule be used in the channel value to pass a parameter?

OriginalPostID-167996

OriginalPostID-167996