Please help with me with these question:
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When an asset (LP/Form/Email) is in draft mode (with a little orange pencil icon), the previously approved version is used everywhere it's used/referenced until the draft version is approved, and hence, it won't run into any errors (in triggers and elsewhere). The draft version is different from the un-approved version (there's no orange pencil or green tick in its icon), if assets are being used or referenced somewhere else in Marketo you cannot un-approve them.