On one database table I got this strange error (Oracle 9.2.0.4 Linux)

ORA-01801: Datumsformat zu lang f³r internen Puffer

I found out that in a date column and in some rows the datevalue is
"corrupted"
If I make an update on this specific row and column everything works okay.

But I am wondering how such incorrect value could be entered in this table.
As I know, this table is updated by a delphi/BDE program and a JAVA program.
But I cannot imagine, that from there the problem is coming.

Thank you for any hints

Regards
Nicolas