But the formula export is only shown if there is a real error.
--> e.g. I've added a 1/0 to my formula and get a division by zero.
But if I try to work with a null-value the complete formula-execution is stoppend and the formula returns nothing.
A formula {businesspartner.firstname} + {businesspartner.surname} will also evaluate to nothing (without error) if one of the used fileds is null.