Not able to get return value from SUP update method.

Hi All

I am new to the SUP world. Have created an Android native app which consists of simple form with 4 input fields and a submit button. For the backend code I have created an MBO , then added an operation name updateShipmentDetails() using operation type as UPDATE from SUP tool. updateShipmentDetails() takes  four String parameter and return a String message.  But once the code is generated for updateShipmentDetails () ,its return type is void, which means I can’t get  any return value/successful message from the SAP .

My query is there is any way to get the return value from update method once its executed successfully.

Thanks & Regards
Mohammed Rehan Rizvi