<div data-hook="admin_stock_movements_form_fields" class="row">
  <div class="alpha four columns">
    <%= f.field_container :quantity do %>
      <%= f.label :quantity, t(:quantity) %>
      <%= f.text_field :quantity, :class => 'fullwidth' %>
    <% end %>
    <%= f.field_container :action do %>
      <%= f.label :action, t(:action) %>
      <%= f.select :action, options_for_select(allowed_actions) %>
    <% end %>
    <%= f.field_container :stock_item_id do %>
      <%= f.label :stock_item_id, t(:stock_item_id) %>
      <%= collection_select 'stock_movement', 'stock_item_id', @stock_location.stock_items, :id, :variant_name,
        { selected: @stock_movement.stock_item_id }, :class => 'select2 fullwidth' %>
    <% end %>
  </div>
</div>

<div data-hook="admin_stock_movements_form_fields" class="row">
  <div class="alpha four columns">
    <%= f.field_container :quantity do %>
      <%= f.label :quantity, t(:quantity) %>
      <%= f.text_field :quantity, :class => 'fullwidth' %>
    <% end %>
    <%= f.field_container :action do %>
      <%= f.label :action, t(:action) %>
      <%= collection_select 'stock_movement', 'action', allowed_actions, :to_s, :to_s,
        { selected: @stock_movement.action }, class: 'select2 fullwidth' %>
    <% end %>
    <%= f.field_container :stock_item_id do %>
      <%= f.label :stock_item_id, t(:stock_item_id) %>
      <%= collection_select 'stock_movement', 'stock_item_id', @stock_location.stock_items, :id, :variant_name,
        { selected: @stock_movement.stock_item_id }, class: 'select2 fullwidth' %>
    <% end %>
  </div>
</div>

Use select2 for all stock movement dropdowns
Use select2 for all stock movement dropdowns
