At 10:35 AM 3/01/2005 +0000, you wrote:

>please tell me a link where i can find all database errors
>explained.

http://www.ibobjects.com/docs/fb_1_5_errorcodes.zip

>for example what does ErrCode : -530 means.

It's a violation of a foreign key constraint. You should also have
received the gdscode 335544466 informing you of the names of the constraint
and the table.

./hb