Foreign Key error

["Jasbinder Singh Bali" <jsbali@xxxxxxxxx>]

Hi,

I have a Pl/Perlu function in which I have written an insert statement in tbl_xyz.
If there's not foreign key in this table, insert works fine.
As soon as i make one of its fields refer to tbl_abc i.e field a in tbl_xyz refering to 
field a in tbl_abc, insert fails.
Now the problem is, I can't see the actual error, i mean the place where it fails.
Is there any way by which I can include a few lines of code that would log any error in a file  
whenever the insert fails.

Thanks,
~Jas