In Journal->Generate MassAllocation : What is the Purpose of 'Balacing Segment Value'?

There is a document 'In Journal->Generate MassAllocation : What is the Purpose of 'Balacing Segment Value'?' ; however, it doesn't have any information.  Why is the Balancing Segment Value included in the Generate MassAllocations required and what does it do?

Thanks,

Nanette
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