Double diapering can be illegal in certain districts and is heavily frowned upon everywhere as it can be viewed as a effort to cover up neglect.  QuickChange Wraps are designed to work by themselves to collect urine. 

In cases where a patient is both bowel and urinary incontinent, a desire to use QuickChanges in conjunction with an outer brief is understandable.  Speak to your leadership team to develop a nuanced answer and approach.