diff --git a/docsource/modules160-170.rst b/docsource/modules160-170.rst
index 38797c9741a..6af359c6ddc 100644
--- a/docsource/modules160-170.rst
+++ b/docsource/modules160-170.rst
@@ -724,7 +724,7 @@ Module coverage 16.0 -> 17.0
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | |new| project_todo                                |                      |Renamed from note.                               |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
-| purchase                                          |                      |                                                 |
+| purchase                                          | Done                 |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
 | purchase_mrp                                      |                      |                                                 |
 +---------------------------------------------------+----------------------+-------------------------------------------------+
diff --git a/openupgrade_scripts/scripts/purchase/17.0.1.2/pre-migration.py b/openupgrade_scripts/scripts/purchase/17.0.1.2/pre-migration.py
new file mode 100644
index 00000000000..cab65448287
--- /dev/null
+++ b/openupgrade_scripts/scripts/purchase/17.0.1.2/pre-migration.py
@@ -0,0 +1,10 @@
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version=None):
+    if not openupgrade.column_exists(env.cr, "purchase_order_line", "discount"):
+        openupgrade.logged_query(
+            env.cr, "ALTER TABLE purchase_order_line ADD COLUMN discount FLOAT"
+        )
+        openupgrade.logged_query(env.cr, "UPDATE purchase_order_line SET discount=0")
diff --git a/openupgrade_scripts/scripts/purchase/17.0.1.2/upgrade_analysis_work.txt b/openupgrade_scripts/scripts/purchase/17.0.1.2/upgrade_analysis_work.txt
new file mode 100644
index 00000000000..1dceb8cb7d8
--- /dev/null
+++ b/openupgrade_scripts/scripts/purchase/17.0.1.2/upgrade_analysis_work.txt
@@ -0,0 +1,21 @@
+---Models in module 'purchase'---
+---Fields in module 'purchase'---
+purchase     / purchase.order           / activity_user_id (many2one)   : not related anymore
+purchase     / purchase.order           / activity_user_id (many2one)   : now a function
+purchase     / purchase.order           / message_main_attachment_id (many2one): DEL relation: ir.attachment
+purchase     / purchase.order           / rating_ids (one2many)         : NEW relation: rating.rating
+# NOTHING TO DO
+
+purchase     / purchase.order.line      / discount (float)              : NEW hasdefault: compute
+# DONE: create column in pre-migration to avoid expensive recomputation
+
+purchase     / res.partner              / buyer_id (many2one)           : NEW relation: res.users
+# NOTHING TO DO
+
+---XML records in module 'purchase'---
+NEW ir.ui.view: purchase.document_tax_totals
+NEW ir.ui.view: purchase.product_template_search_view_purchase
+NEW ir.ui.view: purchase.product_view_kanban_catalog_purchase_only
+NEW ir.ui.view: purchase.product_view_search_catalog
+NEW ir.ui.view: purchase.view_product_product_supplier_inherit
+# NOTHING TO DO