When creating a custom object in Marketo, 3 fields are automatically created: Marketo GUID, Created At and Updated At.
These fields are not available in the contraints when using a filter to which this new custom object is linked. These could be extremely useful if you are planning on using these to track custom activities in CRM so you can leverage the "before" or "after" in your date ranges based on the Created or Updated at values.
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