target can't be delete it

I can't delete a target from oem 10g

In the traces I'm getting from oem console

CE3P1:

java.sql.SQLException: ORA-20600: The specified target is in the process of being deleted.(target name = CE3P1)(target type = oracle_database)(target guid = D4CD73505D874FA6B56001903BD69942) ORA-06512: at "SYSMAN.TARGETS_INSERT_TRIGGER", line 46 ORA-04088: error during execution of trigger 'SYSMAN.TARGETS_INSERT_TRIGGER' ORA-06512: at "SYSMAN.EM_TARGET", line 2125 ORA-06512: at "SYSMAN.MGMT_TARGET", line 2704 ORA-06512: at line 1

Also i tried from the repository without success

SQL> set serveroutput on size 1000000

SQL> exec mgmt_diag.PurgeOrphanTarget(HEXTORAW('D4CD73505D874FA6B56001903BD69942'));