Unable to clear multiple line item document when 1 of the item is locked

Hi Team,

I had scenario where system issued 1 document that contains 2 line items.

Line Item A- Credit Note to Customer

Line Item B- Current Month Charges (Payment Term 30 Days)(Locked)

When we run batch job for outgoing payment (Credit Note) , this Line Item A wasn't able to process due to Locking at Line Item B. The lock applied all items in the same document.

May I ask what is the work around if I need Line Item A to still able to process in outgoing payment while maintaining Line Item B as locked ?

Thanks.