Could you set up a recurring workflow that updates the custom schema based on the subscription origin?
Granted the custom schema isn't updated instantly upon subscription, but you could have the workflow run regularly to ensure this update is made. That's how I'd approach it if the landing page isn't an option.
Okay, I tried to go the other way round and make a Generic landing page template with targeting dimension of my cusBrandEvent table and tried to make an update to this. Unfortunately it seems that even though I can change the targeting dimension to my custom table I get an error when submitting data to it:
First of all thank you for taking the time to answer.
In this particular case I need to update a custom schema on subscription. Is it the type of Landing Page that determines what can be updated?
For instance would it be possible with a Generic Landingpage to update a custom schema?
I am fully aware of the possibility to extend the Profiles Schema with fields but that is unfortunately not a very good solution as the profile fields can be overwritten every time the landing page is submitted for the same customer.
Default Landing Pages (Unsubscription) won't allow you to update any other Schema except Profiles Schema.
You will notice that the Access & loading Section doesn't allow selection of any other Schema, it has Profiles schema selected by itself and this filed is greyed out:
Same would hold true if you will duplicate any of these default pages.
Unless you do some custom implementation on your side which could update some other Schema.
But that again would be similar to an alternative mentioned in ACS - Unsubscription Service wherein a Workflow was suggested to monitor the Profiles Schema and then update the custom Schema accordingly.