Restricting Modification In Component Of Production Order

Hi,

In our business scenario, we have @ 18 users who have authorisation for transaction Code CO02. If these users need to change any component in production order, they change the existing component directly.Keeping the exsting authorisation intact, I want to restrict these users from changing components of a production order. Rather they should delete the component which they want to change & add the same component again with the changed properties.

How to apply lock only for modifying exsting component in the production order?