In the screen for the vertical lift shuttles, accessible through
Inventory > Operations > Vertical Lift Shuttles, a new button has been
added to allow to skip an operation. This button can also be triggered
by scanning the barcode O-BTN.skip.svg that is inside the folder
'images'.
When a skip is done, the next stock.move.line to pick is chosen and
shown to the operator. A skipped move line is added to the end of the
list of pending move lines to be picked, so they will be shown again
in the future as soon as the other move lines have been successfully
processed.
This option was added because, sometimes, the operator can not process
a move line for whatever reason. Right now, the only way of proceeding
is to wait until he/she can effectively process it, which involves a
delay in the operations. With this new skip operation, the operator
can continue processing the rest of move lines.
If there is two move lines for the same product in the vertical lift
(stored in2 differents trays for instance), the pick scenario was
failing when the user was processing the first line.
To circumvent this, instead of validating directly the move, we put the line
in its own stock move, then we put the stock move in its own transfer and
validate this one.
Methods used to do that have been copied from the `shopfloor` module,
they probably deserves their own module as they are quite generic.
