Hi,
Normally GR date is not an issue for GR though one of the item is locked . not sure what system is telling you as a mesaage . Insead locking the item 10 , delete the line item 10 and check whather Goods Receipt is checked in the delivery data of the PO item overview and then try posting the GR .
also check the plant / moment type in the MIGO screen and correct to the PO plant .
Regards,