Trigger Item Category determination in sales order via program

Hi,

We are changing item category through an exit based on a field at item level, which the user would enter manually.

However once the exit changes the item category, if the user reverses his selection or gives another value for which item category should be the orginal one, i need to change the item category back to what was originally determined.

Rather than looking up the config tables of item category determination, we would like to trigger item category determination through the exit itself.

Can someone suggest if this is possible, if so what is the code to be written.

Regards,

KC

SAP SD