Ora-1548 while dropping tablespace

Hi all,

                                                                                           
                                                             I have the following problem. 
                                                                                           
                                                             One datafile was accidently   
                                                             dropped from the tablespace   
                                                             RBS, when the database was in 
                                                             Restricted Mode.When trying   
                                                             to recover i was not able to  
                                                             neither drop the rollback     
                                                             segment nor tablespace. i am  
                                                             getting the following error.  
                                                             when i do a "drop rollback    
                                                             segment RBS01"                
                                                             i get the error               


                                                             "ORA-01545: rollback segment  

                                                             'RBS01' specified not         
                                                             available"                    
                                                                                           

                                                                                           
                                                             When i do a                   


                                                             "drop tablespace RBS          

                                                             including contents"           
                                                             i get the error               


                                                             "ORA-01548: active rollback   

                                                             segment 'RBS01' found,        
                                                             terminate dropping            
                                                             tablespace"                   
                                                                                           
                                                             when i query                  
                                                             dba_rollback_segements i see  
                                                             that the status of the        
                                                             rollback                      
                                                             segment is in "NEEDS RECOVERY 


                                                             "                             

                                                                                           
                                                             I set the event (10015) in    
                                                             the init file to find out the 
                                                             active transaction in the     
                                                             rollback. But no object id    
                                                             was found in the trace file.  
                                                             Is there any way to           
                                                             recover/drop the tablespace   
                                                             other than using  _ parameter 
                                                             ?                             
                                                                                           
                                                                                           
                                                             TiA                           
                                                             Priya                         
                                                                                           
                                                                                           
                                                                                           

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