|ORA-01819:||signed year precludes use of BC/AD|
|Cause:||A date specification contained both a signed year and a B.C./A.D. indicator. If the year is specified with a sign, such as SYYYY, then B.C. or A.D. is implicit in the date and must not be entered.|
|Action:||Remove the B.C./A.D. indicator from the date specification.