Material Characteristics & Class

Hi experts,

My client having business of grapes ,grapes purchase with base unit of measure each & invoice on weight of packet I created characteristics for weight in kg & class 023 for batches so that i got Classification tab in Migo .But my problem is at the time of migo the quantity I put In quantity tab is updated in stock & my quantity put in classification tab , characteristic is not updated in MMBE So please help me where I miss Configuration so that quantity put in characteristics should be updated in MMBE.

Thanks in advance.