Update Processing Status in ME53 screen using a BAPI or BADI

Hi Experts,

For the Transaction ME53N under Item Section ,inside the tab screen STATUS there is a field Proc.Status . We are trying to change the value of this field using a suitable BAPI or BADI. But we haven't succeeded so far . The Reason is that this field is always in Non-Editable mode irrespective of whether the requisition is in change mode or display mode.  Please can anyone of you please suggest if there is any BAPI or BADI using which we can achieve this. Your responses are highly appreciated

Best Regards,

Lakshman