SelectFieldFactory defines a predicate that filters remote options based on the child nodes' nodeType.
Currently the filter rejects all nodes that do not have a nodeType name starting with 'mgnl:'

On the other hand one can define custom nodeType name like 'customer', 'product' in the data module. In this case, if these nodes are refereed as remote option, they will not be shown in the option list.

The DataSelectFieldFactory has to define his own predicate filter in order to allow these custom nodeType names.