Updating more than one table in the same region

Hi all,
I have a header and detail relationship created between to entities. I created an association between them. I have 2 views and a view link based on the 2 entities.
I have built an update page and I'm able to display the detail and header fields in the same region and my update to the detail fields are being processed correctly. However, my update to the header field is not working. I'm not getting any error messages, just that my header field remain unchange even after modifying the value and clicked the submit button on my page.
Any suggestiong as to where I might have made a mistake?

Ok, I got it to work by creating an association between the 2 entity objects and create a view based on the 2 entities. However, my real requirement is to only update the header level entity attribute after performing validations on the detail level attribute. My question now is this,
How do call the set method associated with the header entity from the detail EOImpl?
Please help!

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