Initial check-in of the module sale_advance_payment_management

sale_advance_payment_management/models/sale.py

@@ -0,0 +1,14 @@
+# Copyright 2019 Akretion France (http://www.akretion.com)
+# @author Alexis de Lattre <alexis.delattre@akretion.com>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import fields, models
+
+
+class SaleOrder(models.Model):
+    _inherit = 'sale.order'
+
+    payment_line_ids = fields.One2many(
+        'account.move.line', 'sale_id', string='Advance Payments',
+        readonly=True)
+    # residual