Which Method Should be overriden to update a column in master?

Hi,
I have a Master/Detail relationship with the requirement to update master depending on some column in detail. This update of master can raise an exception and it should be done at post time. The way to update master changes depending on the DML action. If an exception is raised I want to rollback the changes made to master.
I tried prepareForDML, postChanges methods. In both cases the exception is ignored and the transaction is not commited and does not display any message visible. But the exception can be catched and visible on console.
I tried creating a validation method on detail entity. In the validation method I update master and call master.validate. This seems to work but the validation method can be called more than once and thus can update master more than once which is invalid.
So which method should I use to post changes of the master?
I present detail data as a ADF-Table. I want to display the exception as attached to a row in ADF-Table, just below the row in the table. Is it possible?
Regards,
Salim

Jan,
I have OrderItems and deliveryItems entities with 1..* relationship. I want to update OrderItems.deliveredQuantity and OrderItems.returnedQuantity fields based on delivery Type (i.e return, accept). OrderItems entity has an entity-level validation rule as quantity >= deliveredQuantity - returnedQuantity. So it might throw exceptions on Validate.
I decided to implement this functionality in deliveryItemsImpl.postChanges, deliveryItemsImpl.prepareForDML and finally in an entity level validation rule (method) in deliveryItemsImpl. In postChanges and PrepareForDML it just ignores the exception, does not commit, does not give any error messages. In the last case it retries to validate the entity continously and cannot validate. To my opinion it should stop saying this entity is invalid. Isn't?
Jdev 10.1.3.3
ADF-Faces, ADFBC
Regards,
Salim

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Kappy,
Sorry I've not responded for a few days. I've been busy with important issues outside of computing.
I've read your response many times over and although I still find it confusing, it appears that at long last you're beginning to agree with me - that machines that already have a copy of Mavericks pre-loaded are a special case, in that with them you can't just go to the OSX Mavericks Installer at the Apple Store and download the file there, with a view to performing a reinstall of it and/or to make a bootable copy of it, and then expect it to work. Instead, the only options available are to use what's called 'OSX Recovery', or 'Internet Recovery', two mechanisms that are especially built into the Mavericks Mac itself. Now, I might still have got this wrong but I think that the former will restore a copy version of Mavericks on the machine as loaded by the factory (not from Time Machine), whereas the latter will specifically download a new copy of Mavericks from a dedicated Apple server (not the same file as found at the Apps Store). Either mechanism will require the Internet to be accessed.
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