Delete on master detail does not work

I am trying to delete the master record from master table using the master-detail form. I am getting this error
An unexpected error occurred: ORA-02292: integrity constraint ('table_name') violated - child record found
ORA-02063: preceding line from 'Schema name' (WWV-16016).
I checked the 'Cascade delete detail rows on master detail' check box - Logically I would expect it to delete the detail and master record. Does this work? Is there anything that needs to be set in addition to this?
Thanks,
Karuna

Repost
I'm sorry .it do work fine

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