first commit

modules/purchase_price_list/purchase.py

@@ -0,0 +1,26 @@
+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from trytond.pool import PoolMeta
+from trytond.pyson import Eval
+
+
+class Purchase(metaclass=PoolMeta):
+    __name__ = 'purchase.purchase'
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        cls.party.states['readonly'] = (cls.party.states['readonly']
+            | Eval('lines', [0]))
+        cls.lines.states['readonly'] = (cls.lines.states['readonly']
+            | ~Eval('party'))
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'purchase.line'
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        cls.product.context['supplier'] = Eval(
+            '_parent_purchase', {}).get('party')