Can't 'set data value' on a iban_field using rules

Using rules I want to set an IBAN field on an entityformsubmission after a succesful payment. I can set different field on the submission just fine. But the iban_field doesn't show up in the rules UI.

To reproduce:
- Create an entitytype X with some fields and at least an ibanfield.
- Create a Rule with a condition "entity is of type X" , this bring the entities' fields into scope.
- Add an action: "Set a data value" and try and add the iban field, you can't because it doesn't show up. All other fields of the entity do show up.