Vl02n batch number disappeared and field is locked

Hi, gurus. Im fresh starter in sap.

So delivery order got printed with wrong batch number. The item was generated from lt01 funcion from lost&found location to existing bin. After transfering the item from delivery number location (i have no idea why it was there) back to lost&found location it disappeared which is normal but in vl02n batch number also got erased and batch field is locked also line is c/b and I cannot enter the number of item we go physicly on floor. Im looking in to way of adding correct number and confirming that line without post goods issues.

Sincerely Krystian