Freeswitch Callcenter module report oracle reserved field

I have enabled the callcenter module of the freeswitch and for reporting purpose I have integrated the Oracle DB with freeswitch. Now in tier report we have feild called level to reporting but in Oracle DB level is reserved keyword. Now we have created the level feild as string in oracle but freeswitch is not able send the data to oracle as it is not identifying the level string colum. Is there any workaaround for the same ?