[16.0] [FIX] sale_order_line_price_history: Add discount field only if discount group is enabled

sale_order_line_price_history/README.rst

@@ -59,6 +59,9 @@ Known issues / Roadmap
 ======================
 
 * A backend tour would be nice to have.
+* When you are in Kanban View, you can set an historic price from the wizard,
+  but you need to click on the line and save it from form view instead of
+  using sale order save button.
 
 Bug Tracker
 ===========

sale_order_line_price_history/readme/ROADMAP.rst

@@ -1 +1,4 @@
 * A backend tour would be nice to have.
+* When you are in Kanban View, you can set an historic price from the wizard,
+  but you need to click on the line and save it from form view instead of
+  using sale order save button.

sale_order_line_price_history/static/description/index.html

@@ -409,6 +409,9 @@ <h1><a class="toc-backref" href="#toc-entry-1">Usage</a></h1>
 <h1><a class="toc-backref" href="#toc-entry-2">Known issues / Roadmap</a></h1>
 <ul class="simple">
 <li>A backend tour would be nice to have.</li>
+<li>When you are in Kanban View, you can set an historic price from the wizard,
+but you need to click on the line and save it from form view instead of
+using sale order save button.</li>
 </ul>
 </div>
 <div class="section" id="bug-tracker">

sale_order_line_price_history/static/src/js/set_price_to_line_widget.js

@@ -15,7 +15,9 @@ export class SetPriceToLineWidget extends Component {
             type: "ir.actions.act_window_close",
             infos: {
                 price_unit: this.props.record.data.price_unit,
-                discount: this.props.record.data.discount,
+                ...(this.props.record.fields.discount !== undefined && {
+                    discount: this.props.record.data.discount,
+                }),
             },
         });
     }

sale_order_line_price_history/views/sale_views.xml

@@ -22,6 +22,12 @@
                     help="Price History"
                 />
             </xpath>
+            <xpath
+                expr="//field[@name='order_line']/kanban/field[@name='price_unit']"
+                position="after"
+            >
+                <field name="discount" groups="product.group_discount_per_so_line" />
+            </xpath>
             <xpath
                 expr="//field[@name='order_line']/kanban//t[@t-out='record.price_unit.value']/.."
                 position="inside"