Transfer qty to blocked stock - BAPI_GOODSMVT_CREATE

I am trying to transfer quantity to blocked stock. I think I can use BAPI_GOODSMVT_CREATE but I am not sure what to use for the movement type and GM_CODE. I am passing the material, storage location, plant, quantity, UOM, doc date, and post date. What should I use for the movement type and GM_CODE and do I need to pass any additional values?