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Help, this should be easy, but I am afraid to admit that I can't figure it out....

business-entity beStateModel is designed to manage dataset dsStateModel.

During the validation of dsStateModel I need a copy of the complete statemodel data, so I can judge if the diffgram in dsStateModel will produce something consistent.
Therefore I have included a second copy of the dataset. It's the same includefile, but without reference-only and with a prefix. So the class header looks like:

class vmaimo.statemachine.beStateModel inherits oesdk.base.BusinessEntity:

    {vmaimo/statemachine/dsStateModel.i &REFERENCE-ONLY=REFERENCE-ONLY}
    {vmaimo/statemachine/dsStateModel.i &prefix=local}

My problem is: how can I fetch data into dataset localdsStateModel, during the ValidateData() method?
I am sure it must be something obvious but I am messing with either binds that don't work, or with buffernames that are not in the dataset.