### Acceptance criteria

#### Basic - Copied from <mention class="mention" data-id="31992" data-type="work_package" data-text="#31992">#31992</mention>

* For work packages without start/finish dates but _with_ duration:
* they are not visible until a date is specified
* (they can of course be accessed using the &quot;Add Existing&quot; function in the team planner)
* the width of a card that is dragged onto the team planner (from the left-hand &quot;Add Existing&quot; panel, for example) is relative to the total duration of that work package (within the limits of the viewport, of course).
* Once dragged, the start date is set and therefore the finish date is also derived.
* If the user modifies a work package via the drag handles on the left/right edges of the cards on the Team planner, both the start/finish date as well as the duration are altered in lockstep.

#### Additional

**Work packages spanning non-working days**

* Cards will span over a non-working days:
* If non-working days are enabled (via the date picker), a 3-day work package from Thursday will span Thursday to Saturday _(assuming Sat/Sun non-working)._
* If non-working days are not-enabled (via the date picker), 3-day work package from Thursday will span Thursday to Monday _(assuming Sat/Sun non-working)._
* Cards themselves will **not** indicate whether non-working days are included or not.
* Automatically scheduled work packages whose dates are derived should be blocked from dragging (as is the case currently on the GANTT view for parent work packages).

**Creating new cards by clicking/selecting dates**

* When clicking on a single date that is a non-working day
* the work package will be scheduled for that day and
* &quot;Include non-working days&quot; will be enabled in the date picker
* Selecting a range of days that includes a non-working day, but such as start/finish dates are not non-working
* the work package will be scheduled for that date range
* &quot;Include non-working days&quot; will _not_ be enabled in the date picker
* Selecting a range of days such that start/finish dates are non-working
* the work package will be scheduled for that date range
* &quot;Include non-working days&quot; will be enabled in the date picker
* Clicking a day or selecting a range of days that _does not_ include non-working days
* The work package will be scheduled on the selected days
* &quot;Include non-working days&quot; will _not_ be enabled in the date picker

**Dragging or resizing an existing work package**

* Moving a regular work package (&quot;working days only&quot; is Begin of the insertionON):End of the insertion Begin of the deletion ON) to a start date that is a non-working day:End of the deletion
* Begin of the insertionDisplaysEnd of the insertion Begin of the deletion  displaysEnd of the deletion non-working days in red indicating that they are blocked (similar to the permission-based blocking)
* Dropping to a non-working Begin of the insertion**start date**End of the insertion Begin of the deletion start dayEnd of the deletion is not possible. Doing so will cancel the request and display and error message:
* &quot;This work package cannot start/finish on a non-working day.&quot; Begin of the insertion
End of the insertion Begin of the deletion
End of the deletion * Begin of the insertion_Note that it should be possible to drag such that the finish date is a non-working day; in this case, the work package will simply extend to skip over the non-working days, to maintain duration._
* End of the insertion To move this card to a non-working start date, the user has to open the date picker and select &quot;Include non-working days&quot;
* Resizing a card such that its start or end date is a non-working day is not Begin of the insertionpossible (since resizing changes either start date on the left, or the finish date on the right).End of the insertion Begin of the deletion possible:End of the deletion
* This will cancel the change and display an error message:
* &quot;This work package cannot start/finish on a non-working day.&quot;
* Moving a card such that it spans non-working days Begin of the insertion_is_End of the insertion Begin of the deletion isEnd of the deletion possible.
* The start date is the newly selected start date.
* The finish date is adjusted to maintain duration (by skipping non-working days). Begin of the insertion
* This is possible even if the finish date is a non-working day; on drop, the work package will extend to a working day. 
* _For example, if a 5 day work package starting Monday is dragged to start on Tuesday, dropping it there is possible even if the finish date is initially on a Sunday. On drop, the real finish date will be calculated to Monday, skipping the weekends._End of the insertion

**Dragging or resizing a work package that includes non-working days**

* There are no limitations for manually scheduled work package