Program: 139961
Project: 139961
Buggy source:
@Override protected ReturnCode canSave(){
  if (columnListA.size() != columnListB.size()) {
    return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
  }
  if (columnListA.size() > 0) {
    ColumnSet columnSetOwnerA=null;
    ColumnSet columnSetOwnerB=null;
    ColumnSet ownerA=null;
    ColumnSet ownerB=null;
    for (int i=0; i < columnListA.size(); i++) {
      if (!((TdColumn)columnListA.get(i)).getSqlDataType().getName().equals(((TdColumn)columnListB.get(i)).getSqlDataType().getName())) {
        return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
      }
      ownerA=ColumnHelper.getColumnSetOwner(columnListA.get(i));
      ownerB=ColumnHelper.getColumnSetOwner(columnListB.get(i));
      if (i == 0) {
        columnSetOwnerA=ownerA;
        columnSetOwnerB=ownerB;
      }
 else {
        if ((columnSetOwnerA != ownerA) || (columnSetOwnerB != ownerB)) {
          return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
        }
      }
    }
    Package parentCatalogOrSchemaA=ColumnSetHelper.getParentCatalogOrSchema(columnSetOwnerA);
    Package parentCatalogOrSchemaB=ColumnSetHelper.getParentCatalogOrSchema(columnSetOwnerB);
    if (!parentCatalogOrSchemaA.getName().equals(parentCatalogOrSchemaB.getName())) {
      return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
    }
  }
  return new ReturnCode(true);
}

Fixed version (ground truth):
@Override protected ReturnCode canSave(){
  if (columnListA.size() != columnListB.size()) {
    return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
  }
  if (columnListA.size() > 0) {
    ColumnSet columnSetOwnerA=null;
    ColumnSet columnSetOwnerB=null;
    ColumnSet ownerA=null;
    ColumnSet ownerB=null;
    for (int i=0; i < columnListA.size(); i++) {
      String dataTypeNameA=((TdColumn)columnListA.get(i)).getSqlDataType().getName();
      String dataTypeNameB=((TdColumn)columnListB.get(i)).getSqlDataType().getName();
      if (!dataTypeNameA.equals(dataTypeNameB)) {
        if (!((dataTypeNameA.toLowerCase().contains("String_Node_Str") || dataTypeNameA.toLowerCase().contains("String_Node_Str")) && (dataTypeNameB.toLowerCase().contains("String_Node_Str") || dataTypeNameB.toLowerCase().contains("String_Node_Str")))) {
          return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
        }
      }
      ownerA=ColumnHelper.getColumnSetOwner(columnListA.get(i));
      ownerB=ColumnHelper.getColumnSetOwner(columnListB.get(i));
      if (i == 0) {
        columnSetOwnerA=ownerA;
        columnSetOwnerB=ownerB;
      }
 else {
        if ((columnSetOwnerA != ownerA) || (columnSetOwnerB != ownerB)) {
          return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
        }
      }
    }
    Package parentCatalogOrSchemaA=ColumnSetHelper.getParentCatalogOrSchema(columnSetOwnerA);
    Package parentCatalogOrSchemaB=ColumnSetHelper.getParentCatalogOrSchema(columnSetOwnerB);
    if (!parentCatalogOrSchemaA.getName().equals(parentCatalogOrSchemaB.getName())) {
      return new ReturnCode(DefaultMessagesImpl.getString("String_Node_Str"),false);
    }
  }
  return new ReturnCode(true);
}