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Two MSC devices on single USB

I would like to create composite device with two MSC devices using Middleware 7.30 on STM3F4 chip. I have configured everything (already did several projects, so I am familiar with run-time configuration manager) but when attached, I can only see first MSC device (#0). In debugger, I can see both MSC tasks started, though - so it seems that device descriptors are not created correctly (only for single MSC device - not composite one). So, I am not sure if succh possibility exists in the first place? I know I can create composite device with different devices (eg. MSC and CDC - used it in the past), but this one is somewhat specific.

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