VAST-2.0-ad-sequence
Mixed use of sequence attribute across <Ad> elements in a pod
WarningStructureIAB VAST 2.0 §2.2VAST 2.0 and later (all versions)
When serving a pod (playlist) of ads, all `<Ad>` elements should either all have a `sequence` attribute or none should. Mixing sequenced and unsequenced ads leads to undefined playback order.
How to fix
Decide whether this is a pod: if so, add a sequence attribute to every <Ad>; otherwise remove sequence from all of them.
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