>just wondering if anyone could confirm the HookPreSave works when saving a child record. I have a HookPreSave(DataTable dt) in my childobject.partial,

Can you explain me how it works for the parent ?

For what I know HookPreSave(mmBusinessObject bizObj, string tableName) is a method of mmBusinessForm and HookPreSave(mmBaseBusinessObject bizObj) is from mmBusinessBaseForm... there are no HookPreSave(DataTable dt) as I know ?

So no HookPreSave does exist in the BO, how can you then have it in the childBO.partial ?