when one is adding an inline entity for a relation of a single card,
the 'add a new xxx' link disappears. If the user then cancel the addition,
we have to make this link appears back. This is done by giving add new link
id to removeInlineForm.
Add some entities
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As manager, you can access to entity creation forms by using the `site management`_ page.
.. _`site management`: manage
As regular user, the index page or the action box may propose some links to create entities according to the context.