Can't create updatable view

Hello, 

I don't know what's wrong with my Create View-Statement. I always get "Read
only view WITH CHECK OPTION not allowed", but I need a updatable view.
Here's my statement:
CREATE VIEW "VIEW_DSCOPY"
AS SELECT tbl_teile.teilenummer, 
	tbl_teile.lfd_Anfragenummer, 
	tbl_teile.Teilebezeichnung, 
	tbl_teile.Maschinen_ID, 
	tbl_StaffelTeil.angefr_Volumen, 
	tbl_StaffelTeil.lfdNr_Teile, 
	tbl_StaffelTeil.Bemerkung_Teilepreis, 
	tbl_StaffelTeil.Bemerkung_WKZ_Kosten 
FROM tbl_Teile, tbl_StaffelTeil 
WHERE tbl_Teile.lfdnr_teile = tbl_Staffelteil.lfdnr_Teile  WITH CHECK OPTION

The tables has these constraints: 
tbl_Teile: with a third table which isn't include in the view
tbl_Staffelteil: FOREIGN KEY "REF_TEIL_STAFFFEL"	("LFDNR_TEILE")
REFERENCES "ALLUSERS"."TBL_TEILE" ("LFDNR_TEILE") ON DELETE  CASCADE

Did I miss something in the docs?

Thanks in advance
Peter