An inventory "Movement" or "Movement by template" executed in the mobile warehouse app will always default the available physical inventory in the FROM location of the item/variant to move.
Even when a default value is configured in the mobile menu item (use default data = yes, default value configured for field "Quantity") the system does not take this into account.
This behaviour is unexpected (if a default value for quantity is configured it should supersede the defaulted available physical inventory); at the moment it is impossible to implement rather common flows such as always have the operator input the quantity to move (default quantity = 0) or move 1 (default quantity = 1).

Suggestion: have the default value on "Quantity" field applied at all times in mobile menu items "Movement" and "Movement by template". Should a default value on "Quantity" not be provided the as-is behaviour should be retained.