OSB business service transforming a date column 1936 to 2036 ( 1950)

Hello, I'v a database view with a normal date column "geburtsdatum".
Data Dictionary:
GEBURTSDATUM DATE
Now with JDeveloper I create a db-adapter. This works fine.
On OSB I do generate a business service on the just created jca file. Also this works fine.
XSD for db adapter:
<xs:element name="geburtsdatum" type="xs:dateTime" minOccurs="0" nillable="true"/>
I can test this business service successfully, everything is fine, but not the date interpretation when birtdate <1950
Sample geburtsdatum (birtdate): 29-JUL-1934
DATABASE: 29.07.1934
OSB Business Service: 29.07.2034
Why or where happends this date conversion?
This is very strange, anyone had the same problem?
Any help would be appreciated.
Thanks
Best regards,
Reto

After all I found the solution. Again the problem has been caused on DB side.
I'm using a view. On this view I had a DATE column with a decode. I think I did a clean TO_DATE casting, but it seems as the OSB DB Adapter did not interpret this correctly.
(on database side with SQL I did not have any problems here)
My solution was:
Using a date returning function (which does my decoding) in my view :
CREATE VIEW xyz AS
SELECT ...
, myPackage.removeMaxDate(n.geburtsdatum) as geburtsdatum
FROM ...
Regards,
Reto

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OS is winXP
database is Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64bit Production
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