Consumption Quantity Editable in MIGO for 543 Movemnt Type

Hello Experts,

I have a scenario where my consumption quantity in MIGO for 543 movement type is editable as per Standard SAP.

But my client wants it to be un-editable so that user may not change the quantity.

For E.g:

If my 101 quantity is---2000 and consumption quantity should also be 2000.

Client is not acceptable as the field is editable and said if end user will change consumption quantity to 4000.

Kindly suggest any solution for it,I have already referred some SCN thread's but did not find any appropriate solution.(http://scn.sap.com/thread/846781)

Is there any User Exit,BADI,BAPI which can resolve my problem?

Regards,

Amit Sharma