Block Item Conditions Changing In Billing For Particular Item Category

Dear Experts,

     I would like to ask if there is any way to block item conditions changing (display only) for particular item category, in transaction VF01 (Create Billing).

     AS-IS:

     For all item category, the item conditions is changeable in VF01

     TO-BE:

     I have 3 types of item category in sales order, these are the classification that i want to maintain:

• TAK (delivery related billing) - item conditions not changeable
• ZVER (delivery related billing) - item conditions not changeable
• ZDIN (order related billing) - item conditions changeable

     Thank you.

Regards,

Leo