This shows an issue with the summernotes module (not being editabel).
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Start the app with program arguments -m domainapp.appdefn.DomainAppAppManifestWithFixtures
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Login with sven/pass
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Click 'SimpleObjects' → 'List All'
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Select one from the list and navigate to tab 'Other'
See: platform/module-simple/src/main/java/domainapp.modules.simple.dom.SimpleObject