diff --git a/product/ERP5Banking/Document/CheckOperationLine.py b/product/ERP5Banking/Document/CheckOperationLine.py
index 55a052d53b590321285246b5ef8917ed810d1180..dfb4b04883857d0c4e6fc8d93617499557558f8d 100755
--- a/product/ERP5Banking/Document/CheckOperationLine.py
+++ b/product/ERP5Banking/Document/CheckOperationLine.py
@@ -61,3 +61,24 @@ class CheckOperationLine(BaobabMixin, DeliveryLine):
                     , PropertySheet.ItemAggregation
                     )
 
+  security.declareProtected(Permissions.View, 'getDestinationPaymentInternalBankAccountNumber')
+  def getDestinationPaymentInternalBankAccountNumber(self, default=None):
+    """
+    Getter for internal account number
+    """
+    dest = self.getDestinationPaymentValue(default)
+    if dest is default:
+      return default
+    else:
+      return dest.getInternalBankAccountNumber(default)
+
+  security.declareProtected(Permissions.View, 'getSourcePaymentInternalBankAccountNumber')
+  def getSourcePaymentInternalBankAccountNumber(self, default=None):
+    """
+    Getter for internal account number
+    """
+    src = self.getSourcePaymentValue(default)
+    if src is default:
+      return default
+    else:
+      return src.getInternalBankAccountNumber(default)