In PMML 4.4, inside MiningModels, OutputFields of a previous segments may be used as Input for following segments.

See http://dmg.org/pmml/v4-4-1/FieldScope.html

"Model elements contain Outputs which externalize the variety of model results that can be produced from the model element. Outputs are generally local to a model, except when the model is used in a model chain as part of a MiningModel. In a model chain, all Outputs from the segment models become part of the enclosing mining model scope. As a result, the Outputs of one segment model may be used as an input to any of the subsequent segment models."

e.g.

 <Segment id="3" weight="1">
                ....
                    <Output>
                        <OutputField name="probablity_2" optype="continuous" dataType="double" feature="predictedValue"/>
                    </Output>
			....
<Segment id="4" weight="1">
               ...
                    <MiningSchema>
                       ...
                        <MiningField name="probablity_2" usageType="active"/>
                   ...

Fix inside
KiePMMLModelCodegenUtils.init ->
ModelUtils.convertToKieMiningFieldList

Similarly, LocalTransformations of a "parent" MiningModel" should be available to nested models.

See: http://dmg.org/pmml/v4-4-1/FieldScope.html