Editing Dwarf cancels Construct Building: Item blocking site

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This occurs when a dwarf is trying to clear the tile(s) of a building site and there is an item which the [[dwarf]] is not allowed to pick up lying on the ground where you want to place the [[building]].

For instance...
*... the item is [[forbidden]].
*... the item is marked for [[dump]]ing.
*... the item is tasked to be used in a different building.
*... the item is tasked to be hauled to a [[stockpile]].
*... the item is tasked to be hauled to the [[trade depot]].
*... the item is tasked to be used in a [[workshop]].

This can happen often when you have a field of mined stones and you have designated multiple buildings to be built using those stones in that area. If two buildings require stones located at each others' building sites (e.g. "Workshop A"'s stone is in the way of "Wall B", and vice versa), both buildings will be suspended upon the arrival of a builder, since the other's stone can't be moved.

More broadly, this can happen if an item blocking a building site is reserved for another job - for instance, a stone queued to be [[haul]]ed to a [[stockpile]] or a [[dump]] will not be touched by a dwarf attempting to build a building on top of that stone. This can happen when several masons are actively using stones in the same area, when an excess of stones are queued to be hauled to a stockpile, or if stones are marked for dumping, among other things.

If an item is reserved for another job, it will probably ''(read "hopefully")'' be taken away very quickly as that job is handled; you can often just un-suspend the construction and it will complete with no further error.  [[Forbid]]den items, however, will have to be manually unforbidden in order to make construction possible.

In extreme cases, try the following steps:
:# pause the game, via {{k|spacebar}}. 
:# [[forbid]] any and all items that might possibly be blocking the building. (This can be done via {{k|k}}, then {{k|f}}, ''or'', for larger areas, via {{k|d}}, {{k|b}}, {{k|f}} and then either using {{k|Enter}} to designate a large area or left-clicking with the mouse.) This will cancel any tasks associated with all items.
:# unforbid them again.
:# remove the workshop/building job, via {{k|q}}, {{k|x}}.
:# re-designate the same workshop/building job - or a few less than you had before, if several might be overlapping.  This is to prioritize that building for your (now idle?) construction dwarves.
:# and, if it's not obvious, then unpause the game, via {{k|spacebar}}. 

In very rare cases, the worst culprit is a piece of [[clothing]] that a dwarf has discarded while changing into [[armour]]. That personal item may be permanently tasked for retrieval, yet due to a known game glitch the dwarf will never retrieve it. In such cases, alternating the dwarf in question between armour levels, from "clothing" to "leather" to "plate" and back, ''repeatedly'', may (eventually) shake them out of it and they'll grab their sock, or whatever has brought construction to a magma-gargling halt. For particularly stubborn cases, [[Utility:DFHack|DFHack]] provides several commands that can clear things up: "cleanowned scattered" will confiscate owned items that were abandoned by your dwarves (allowing them to be stockpiled or dumped), and "autodump destroy-here" simply eliminates items under the cursor.

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