How do I remove wall designations?

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I ordered my dwarf to build a wall, but while he was carrying stone to it, I posted an alert making all dwarves drop what they were doing and run to the burrow point.
When the alert is turned off, no one resumes building the wall. I tried to remove the wall designation, but d
->n
does not work. d
->x
does not work either.
How do I remove a wall designation that hasn't been built yet? (also why do the dwarves not resume the task? Is it a bug?)
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How to Demo and Remove a Wall
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ksenia Chernaya, Ksenia Chernaya, ready made, Ksenia Chernaya