PopulateMergeMatch with HasOne?

[nebucaz]

Might be this might be more of a feature request than an issue: I tried to define a PopulateMergeMatch using ForeignKey Fields, but it did not work. I tried the following yams-code (Mandant & Plan are separate Objects)

Contract:
  bronze:
    Start: '2016-01-01 00:00:00'
    End: '9999-12-31 23:59:59'
    Mandant: =>Mandant.default
    Plan: =>Plan.test
    PopulateMergeMatch:
      - Plan
      - Mandant

This throws a n SQL-Error Unknown column 'Plan' in 'where clause' because there is no such column in the Database. Changing the merge-fields to database-Columns like this:

PopulateMergeMatch:
  - PlanID
  - MandantID

yields a php runtime error of ERROR [Notice]: Undefined index: MandantIDbecause this field is not found in the yams definition. I can not use PopulateMergeWhen: "MandantID = =>Mandant.default AND PlanID = =>Plan.test" because the yaml -references will not be replaced with the real values.

Any idea how to achieve this?

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