first commit

modules/project_revenue/purchase.py

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+# 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.model import fields
+from trytond.pool import PoolMeta
+from trytond.pyson import Eval
+
+
+class Line(metaclass=PoolMeta):
+    __name__ = 'purchase.line'
+
+    work = fields.Many2One(
+        'project.work', "Work Effort",
+        domain=[
+            ('company', '=', Eval('_parent_purchase', {}).get('company', -1)),
+            ],
+        states={
+            'invisible': Eval('type') != 'line',
+            },
+        depends={'purchase'},
+        help="Add to the cost of the work effort.")