The documentation for Designing a decision service using DMN models, mentions support for DMN 1.2 models, but the product team has confirmed that RHDM also provides runtime support for DMN 1.1 models. Support scope for DMN 1.1 models should also be added to the documentation.
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1.1. DMN conformance levels

Red Hat Decision Manager provides design and runtime support for DMN 1.2 models at conformance level 3
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