While saving UFT script, it is throwing message
"Unable to cast object of type "HP.QTP.Backend.Entitles.ExternalActionDocument " to type "HTP.QTP.Backend.Entitles.ActionDocument" .
This occurs while saving a script? What does your script look like?
ExternalActionDocument and ActionDocument appear to be UFT objects, not Infragistics objects, so I'm not sure what they are or what they do. What version of UFT are you using and what version of the Infragistics TestAutomation Add-In do you have installed? If you send me the script and provide the version details I can try and see if I reproduce the error.