How to Coda a guest list?

The blue number on the button tells how many extra (new) guests you can add. In the example below it concerns:

14

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The details of these people are not yet known, you have to add them. When you have more people than you are ‘allowed’ to have, you can put them on the

Waiting List

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. A negative number means that you are adding to the waiting list. In the

Waiting List

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you cannot add a role, this is programmed on purpose. Have a look how it is done in the item settings of the lookup.