diff --git a/src/main/resources/mapper/quotation/QuoteBomHeaderMapper.xml b/src/main/resources/mapper/quotation/QuoteBomHeaderMapper.xml
index d5836d0c..b9b7035b 100644
--- a/src/main/resources/mapper/quotation/QuoteBomHeaderMapper.xml
+++ b/src/main/resources/mapper/quotation/QuoteBomHeaderMapper.xml
@@ -97,7 +97,7 @@
                a.alternative_no,
                a.component_part,
                p.part_desc                                   as componentPartDesc,
-               dbo.get_part_unitCost(a.site, a.part_no)      as unitCost,
+               dbo.get_part_unitCost(a.site, p.part_no)      as unitCost,
                a.print_unit,
                dbo.get_um_name(a.print_unit)                 as printUnitName,
                a.qty_per_assembly,