[FIX & IMP] purchase: Remove weird domain in attrs & add purchase order on account move line.

This commit removes "state = purchase" in account move attrs domain. The purchase state doesn't exist.
This commit adds a related field to purchase order in account move line.

Task ID: 2312024

closes odoo/odoo#55611

Signed-off-by: oco-odoo <oco-odoo@users.noreply.github.com>

addons/purchase/models/account_invoice.py

@@ -131,6 +131,7 @@ class AccountMoveLine(models.Model):
     _inherit = 'account.move.line'
 
     purchase_line_id = fields.Many2one('purchase.order.line', 'Purchase Order Line', ondelete='set null', index=True)
+    purchase_order_id = fields.Many2one('purchase.order', 'Purchase Order', related='purchase_line_id.order_id', readonly=True)
 
     def _copy_data_extend_business_fields(self, values):
         # OVERRIDE to copy the 'purchase_line_id' field as well.

addons/purchase/views/account_move_views.xml

@@ -10,9 +10,9 @@
             <field name="invoice_vendor_bill_id" position="after">
                 <field name="purchase_id" invisible="1"/>
                 <label for="purchase_vendor_bill_id" string="Auto-Complete" class="oe_edit_only"
-                       attrs="{'invisible': ['|', '|', ('state','not in',['draft']), ('state', '=', 'purchase'), ('move_type', '!=', 'in_invoice')]}" />
+                       attrs="{'invisible': ['|', ('state','!=','draft'), ('move_type', '!=', 'in_invoice')]}" />
                 <field name="purchase_vendor_bill_id" nolabel="1"
-                       attrs="{'invisible': ['|', '|', ('state','not in',['draft']), ('state', '=', 'purchase'), ('move_type', '!=', 'in_invoice')]}"
+                       attrs="{'invisible': ['|', ('state','!=','draft'), ('move_type', '!=', 'in_invoice')]}"
                        class="oe_edit_only"
                        domain="[('company_id', '=', company_id), ('partner_id','child_of', [partner_id])]"
                        placeholder="Select a purchase order or an old bill"
@@ -28,6 +28,7 @@
             <!-- Add link to purchase_line_id to account.move.line -->
             <xpath expr="//field[@name='invoice_line_ids']/tree/field[@name='company_id']" position="after">
                 <field name="purchase_line_id" invisible="1"/>
+                <field name="purchase_order_id" attrs="{'column_invisible': [('parent.move_type', '!=', 'in_invoice')]}" optional="hide"/>
             </xpath>
             <xpath expr="//field[@name='line_ids']/tree/field[@name='company_id']" position="after">
                 <field name="purchase_line_id" invisible="1"/>