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Please add read only module specification version field into Edit Module dialog ( NB Project properties|libraries|Edit ...). It will contains the specification version of module in nb platform of project. It is usefull when is changed the NB platform of project. The user doesn't know the specification version. Related problem was described in issue #68631.
Probably better handled in a different way, e.g. warning in properties dialog if a dep is requested which in whatever way will not be satisfiable at runtime. Note that it is not automatically safe to "backdate" a dependency; even if compilation succeeds, there might have been a semantic API change made which you are relying on the newer version of.
Note that it is now the case that using too high a spec version will result in a build failure.
Implementation of this issue depends on the way how the issue 70917 will be finally implemented. Than this one could become invalid or it will be implemented in a different way that it is suggested in original comment.
I'm not working on APISupport anymore. Reassigning to owner of the component, so the issue is not 'forgotten' forever.
Prefer to implement issue #70917.