Kurt Vermeiren the issue is that ORM replaces instance_label with this_.instance_label as instance_label is a column name.

The code doing that is in Template#renderTransformerReadFragment. The code is very naive and I can't really think of a way to fix this issue without having a parser for the expressions.

For now, you can workaround it by avoiding using column names in your tranformer expression. It's simple for the function name, might be a bit uglier for the p_instance_label column name.