Deletes custom data for an assessment that was stored by the SetAssessmentCustomData method. Returns an XML or JSON document containing the keys of the values that were deleted, the count of keys remaining for which there are values, and whether all of the assessment's custom data values were deleted.
Use the SetAssessmentCustomData method to store an assessment's custom data. Use the GetAssessmentCustomData method to retrieve an assessment's custom data that was set by the SetAssessmentCustomData method.