Please kindly suggest why my below expression not working
RunningValue(Fields!EXST_CHECK.Value,CountDistinct,"PROGRAM_DATA")/RunningValue(Fields!PATIENT_REGISTRATION_ID.Value,CountDistinct,"PROGRAM_DATA")
Error - The Value expression for the text box ‘Textbox37’ has a scope parameter that is not valid for RunningValue, RowNumber or Previous. The scope parameter must be set to a string constant that is equal to the name of a containing group within the Tablix ‘Tablix4’.