Question : Error on cascading delete command / ORA-02291

Hello guys! I have a mastertable called TBL_VEG_MAINDATA (PK cnt_veg_maindata) and a subtable TBL_VEG_SUBDATA, which references the parent pk column using a foreign key. The foreign key is set to cascade on delete. Hence when I delete a parent entry, all related datsets in my subtable should be automatically deleted as well. Nevertheless, whenever I delete a parent record from TBL_VEG_MAINDATA, I stumble upon an integrity constraint (parent key not found).
In fact I expect the rdbms to automatically forward the delete request to the subtable when the parent dataset is deleted.

Do you have an idea what I am doing wrong?

A million thanks in advance!

Brgds,

Seb

Answer : Error on cascading delete command / ORA-02291

This is another foreign key:
ALTER TABLE  "TBL_VEG_MAINDATA" ADD CONSTRAINT "CON_FK_TBL_MAINDATA" FOREIGN KEY ("LNG_GEBIET")
        REFERENCES  "TBL_GEBIET" ("CNT_GEBIET") ON DELETE CASCADE ENABLE