Cannot DROP database

Hello, I'm really new in informix world and I have I think easy question... So I need drop db from current dbspace and recreate it in new dbspace. I've created new dbspace with onspaces, got dbexport on another server and now need dbimport it. But... informix@czhs0300: onstat -g sql Informix Dynamic Server Version 7.31.UD7 -- On-Line -- Up 00:10:35 -- 372392 Kbytes informix@czhs0300: onstat -g ses Informix Dynamic Server Version 7.31.UD7 -- On-Line -- Up 00:10:39 -- 372392 Kbytes session #RSAM total used id user tty pid hostname threads memory memory 30 informix - 0 - 0 8192 5320 8 informix - 0 - 0 8192 5320 7 informix - 0 - 0 16384 13856 6 informix - 0 - 0 8192 5320 4 informix - 0 - 0 16384 13856 3 informix - 0 - 0 8192 5320 2 informix - 0 - 0 8192 5320 when i'm dropping cah with dbaccess->Databases->Drop->db name then YES This error appears 425: Database is currently opened by another user. 107: ISAM error: record is locked. This make me consfused ... Nobody is using it! Could you help me pls?