Hi Justin,
You should be a little clear. What I understood want to put value of LGORT into GV_LGORT, that means:
GV_LGORT = ITEM_TABLE-LGORT.
Why do you want to do that? ITEM_TABLE could have more than one rows. Suppose ITEM_TABLE has 3 rows. Which row (ITEM_TABLE-LGORT) value will you assign in GV_LGORT. When row will increase, it will changed the value of GV_LGORT.
That's why, I told you to be more clear with you requirement.
Regards
Piyush