Need to capture Change of NAME1 of ShipTo in VA02

Dear Experts,

     I am implementing the user exit MCS10001 to enhance field of 2LIS_11_VAITM.

     In this user exit, we need to populate before (Y-Table) and after (X-Table) images.

     The question is how I can get the after image when changing the Name1 of Ship-To before the document saved. We can't simply select data from ADRC table, as it still keeps the old value (before image) at that time. I checked the table XVBARDR, but it doesn't keep the value from ADRC.

     Is there any FM to get the name1 before the document saved?

     (For example, I used to use FM STATUS_READ to get the changed value of object status before document saved.)

Regards,