diff -r 1a408c6814aa asset.py
--- a/trytond/trytond/modules/account_asset/asset.py	Tue Aug 08 18:47:37 2017 +0200
+++ b/trytond/trytond/modules/account_asset/asset.py	Mon Oct 23 16:19:43 2017 +0200
@@ -517,17 +517,27 @@
             account_asset = self.supplier_invoice_line.account
         else:
             account_asset = self.product.account_asset_used
+        party = (account_asset.party_required and
+            self.supplier_invoice_line and
+            self.supplier_invoice_line.invoice.party or None)
 
         asset_line = MoveLine(
             debit=0,
             credit=self.value,
             account=account_asset,
             )
+        if party:
+            asset_line.party = party
         depreciation_line = MoveLine(
             debit=self.get_depreciated_amount(),
             credit=0,
             account=self.product.account_depreciation_used,
             )
+        party = (self.product.account_depreciation_used.party_required and
+            self.supplier_invoice_line and
+            self.supplier_invoice_line.invoice.party or None)
+        if party:
+            depreciation_line.party = party
         lines = [asset_line, depreciation_line]
         square_amount = asset_line.credit - depreciation_line.debit
         if square_amount: