Hi Stefan.
I found table wich use this LOBSEGMENT and I run
SQL> alter table SAPI01.ZBD_HRF_CELLS drop unused columns;
alter table SAPI01.ZBD_HRF_CELLS drop unused columns
*
ERROR at line 1:
ORA-12996: cannot drop system-generated virtual column
Now I think about how drop column or move segment.