Hi,
I am not sure why you are combining two movement types where each movement type represents one set of logistic character for goods movement and transaction key involved in it in t.code OMWN
Better understand business requirement and purpose of goods movement to create new movement type, and then create your new movement type by copying from standard one but than check entry in table T156X for your new movement type. Refer
PURPOSE OF CREATION OF NEW MOVEMENT TYPE
Regards,
Biju K