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This is a maintenance release for OpenMRS 1.9.0, which fixes several bugs.
There is one database change between OpenMRS 1.9.0 and 1.9.1:
Please also see OpenMRS 1.9.0 Release Notes for additional resolved issues and new features since version 1.9.0.
The Logic module is bundled with OpenMRS 1.9.1 and is marked as core. It can be upgraded, but can not be removed:
From this release we do not include other modules than Logic in war. The standalone is shipped with Logic (above) and this set of bundled modules: