Update services_ledger.xml (#315)

diff --git a/applications/accounting/servicedef/services_ledger.xml b/applications/accounting/servicedef/services_ledger.xml
index 80f3dc1..5138f10 100644
--- a/applications/accounting/servicedef/services_ledger.xml
+++ b/applications/accounting/servicedef/services_ledger.xml
@@ -136,7 +136,7 @@
     <service name="updateGlReconciliation" default-entity-name="GlReconciliation" engine="entity-auto" invoke="update" auth="true">
         <description>Update a GlReconciliation record</description>
         <permission-service service-name="basicGeneralLedgerPermissionCheck" main-action="UPDATE"/>
-        <auto-attributes include="pk" mode="INOUT" optional="false"/>
+        <auto-attributes include="pk" mode="IN" optional="false"/>
         <auto-attributes include="nonpk" mode="IN" optional="true">
             <exclude field-name="createdByUserLogin"/>
             <exclude field-name="lastModifiedByUserLogin"/>