diff --git a/modules/purchase_trade/valuation.py b/modules/purchase_trade/valuation.py
index 801b588..e767c80 100644
--- a/modules/purchase_trade/valuation.py
+++ b/modules/purchase_trade/valuation.py
@@ -179,7 +179,7 @@ class ValuationBase(ModelSQL):
                     values = cls._build_basis_pnl(line=line, lot=lot, sale_line=None, pc=pc, sign=-1)
                     if line.mtm:
                         for strat in line.mtm:
-                            values['mtm'] = strat.get_mtm(values['qty'])
+                            values['mtm'] = strat.get_mtm(values['quantity'])
                             values['strategy'] = strat
                 
                             if values:
@@ -200,7 +200,7 @@ class ValuationBase(ModelSQL):
                     )
                 if line.mtm:
                     for strat in line.mtm:
-                        values['mtm'] = strat.get_mtm(values['qty'])
+                        values['mtm'] = strat.get_mtm(values['quantity'])
                         values['strategy'] = strat
             
                         if values:
@@ -227,7 +227,7 @@ class ValuationBase(ModelSQL):
                         values = cls._build_basis_pnl(line=line, lot=sl, sale_line=sl_line, pc=pc, sign=+1)
                         if sl_line.mtm:
                             for strat in line.mtm:
-                                values['mtm'] = strat.get_mtm(values['qty'])
+                                values['mtm'] = strat.get_mtm(values['quantity'])
                                 values['strategy'] = strat
                     
                                 if values:
@@ -248,7 +248,7 @@ class ValuationBase(ModelSQL):
                         )
                     if sl_line.mtm:
                         for strat in sl_line.mtm:
-                            values['mtm'] = strat.get_mtm(values['qty'])
+                            values['mtm'] = strat.get_mtm(values['quantity'])
                             values['strategy'] = strat
                 
                             if values: