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PCC-02108:

UNSAFE_NULL=YES allowed if MODE=ORACLE and DBMS=V7 or V8
Cause: UNSAFE_NULL=YES was specified on the command line, but but either the MODE was not ORACLE or the DBMS was not V7 or V8.
Action: Specify MODE=ORACLE and DBMS=V7 or V8 when using UNSAFE_NULL=YES.