Form and report on table apex 4.0

Dear all,
I installed Apex 4 in rdbms 11R2 based on Linux, created a workspace, everything went fine.
Now when I try to create a simple form and report based on a table I'm running into problems.
(I believe I'm doing something wrong, because I didn't see any similar thread) here is what I did:
table: master_hierarchy_level
LEVEL_ID     NUMBER(8,0)     No
LEVEL_NAME     VARCHAR2(20 CHAR)     No
LEVEL_DESC     VARCHAR2(320 BYTE)     Yes
CREATION_DATE TIMESTAMP(0) WITH TIME ZONE No
CREATED_BY     VARCHAR2(20 CHAR)     No
UPDATE_DATE     TIMESTAMP(0) WITH TIME ZONE     Yes
UPDATED_BY     VARCHAR2(20 CHAR)     Yes
VALID_FROM     TIMESTAMP(0) WITH TIME ZONE     No
VALID_UNTIL     TIMESTAMP(0) WITH TIME ZONE     Yes
After creating the 2 pages I edit the data fields at the form page to display by default the current date and time:
a) Format Mask: DD-MON-YYYY HH24:MI:SS
b) Source Type: SQL query ......
c) Source Value: SELECT TO_CHAR(SYSDATE, 'DD-MON-YYYY HH24:MI:SS') FROM dual;
For the created_by and updated_by fields I did:
a) Source Type : PL/SQL Expression or Function .....
b) Source Value : :APP_USER
Nothing else, when I run the report and click the create button everything is fine after filling in the required fields and pushing the save button I receive following error:
ORA-01400: cannot insert NULL into ("MASTERDB_V01"."MASTER_HIERARCHY_LEVEL"."CREATION_DATE")
error      Unable to process row of table MASTER_HIERARCHY_LEVEL.
I tried to find out why now already for several hours and have no clou anymore to look for,
is somebody able to provide me a hint :-) ??????
Thanks in advance, Olaf

Olaf,
when you changed the source type/value of your date fields you removed the connection from the page item to the database table/column.
In other words APEX doesn't know that your date fields need to be stored in the table.
Please set source type back to database column and use the default-value setting to set a default value for the date fields.
brgds,
Peter
Blog: http://www.oracle-and-apex.com
ApexLib: http://apexlib.oracleapex.info
Work: http://www.click-click.at

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