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 mwaCustomer=_OBJ'GetChildHandle("CustomerNo")

Steps:
                Escape/break out of code
                OBJ
                Find the object you want from the SY_ChildColl section
                                *note that there may be more than 1 set of child objects listed, and you may have to try a few till you get what you want
                Document the name / ID in the () ie (CustomerNo) or (ArDivisionNo)
                                They normally use part of the key as the name of the service object
                Exit out of OBJ
                ? =_OBJ'GetChildHandle("CustomerNo")
                Check to make sure that id matches