Need to Insert original item number in RA_INTERFACE_LINES_ALL table post sales order shipping

Hi,

I have a Groovy script that runs in the backend whenever I enter sales order details and click the save button. The script flips the item in our system. However,when shipping the sales order, all the data is inserted into the RA_INTERFACE_LINES_ALL table. In this case, I need to Insert the original item number into the RA_INTERFACE_LINES_ALL table instead of the flipped item.

Could Someone guide me on how to achieve this.