Sales Invoice - Items not loading Using Get Items From Sales Order

Hi

We created Sales Order SO001 - Item A - 10 Qty
and made entry Sales Invoice SI001 against Sales Order SO001 - Item A - 10 qty.(Using Get Items From)
and made entry Sales Return CN001 against Sales Invoice SI001 - Item A - 10 qty.

After rework the item and While making Sales Invoice against same Sales Order SO001 - Item A - 10 qty won’t Show. What will be issue. Is the process correct or bug.
Please clarify. Thanks.

SO NO ITEM SO QTY SI NO SI QTY CN NO CN QTY Pending Order Qty
SO001 Item A 10 SI001 10 CN001 -10 10