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ASSERT: make sure you have an application with 1 embedded cartridge (ex. mysql embedded)
EXEC: in the OpenShift Explorer : pick your app and choose Edit Embedded Cartridges
EXEC: uncheck the embedded cartridge that's currently added to your app and check a different 1 - 1 addition, 1 removal (ex. uncheck mysql , check postgres
Result:
The embedded cartridge you unchecked was not removed. If you did this with postgres/mysql then you'll get an error that tells you that only 1 database at the time is permitted.