How to prevent update to custom table (rapid application)?

Hi Experts,

I have a question regarding update to custom table (rapid application).

Currently there's code to prevent update to the custom table in method EH_ONSAVE (when save button is clicked - error is displayed and changes will not be saved).

The issue is when Back button is clicked, pop up is shown asking whether to save the changes (standard CRM behavior). Changes is saved when Yes is clicked. ORDER_SAVE badi is not useful in this case, does anyone know how to stop it from saving?

Thanks,

Jacinth.