Oracle 11g database stores CAS number incorrectly in chemical database.

Hi,
I have an issue in Oracle 11g database. I am working on a chemical database which handles chemical structures ,formulas, CAS numbers, ACX number. The database has a compound table which stores compound attributes like chemical structure, molecular weight, CAS number and so on. The CAS number is of type varchar2(15) and will be in the format 50-50-0. All the CAS numbers will be in this format.
The issue which I found specific to Oracle11g database is that when a CAS number is edite and saved from the application it changes into some random characters like AEAAAA8AA in the table. With Oracle 10g version there were no issues. Can anyone please help me to understand what could be the reason for this? Looking forward to your replies on this.
Thanks

Ok, thanks to all for pointers on finding the alert log. Found it. here's the relevant section, I believe:
ARCH: Error 19809 Creating archive log file to 'D:\ORADATA\FASTRECOVERY\....\ARCHIVELOG\2012_11_07\O1_MF_1_2456_%U_.ARC'
Errors in file C:\APP\diag\rdbms\....\trace\ukgb01_ora_3308.trc:
ORA-16038: log 2 sequence# 2456 cannot be archived
ORA-19809: limit exceeded for recovery files
ORA-00312: online log 2 thread 1: 'F:\ORADATA\REDO\....\REDO02.LOG'
USER (ospid: 3308): terminating the instance due to error 16038
ARC0: STARTING ARCH PROCESSES
System state dump requested by (instance=1, osid=3308), summary=[abnormal instance termination].
System State dumped to trace file C:\APP\diag\rdbms\.....\trace\xxxxx_diag_504.trc
Dumping diagnostic data in directory=[cdmp_20121107205514], requested by (instance=1, osid=3308), summary=[abnormal instance termination].
Instance terminated by USER, pid = 3308
Wed Nov 07 21:13:40 2012
Adjusting the default value of parameter parallel_max_servers
from 640 to 185 due to the value of parameter processes (200)
Starting ORACLE instance (normal)
I'm new to all this. What do I do in rman to clear this up?

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Oracle 11g database stores CAS number incorrectly in chemical database.

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