Group Requisition Import By functionality

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Group Requisition Import By functionality

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Hi - Does anyone have any document explaining how Group Requisition Import By works. I did fair amount of testing yesterday to understand how this works, but still couldn't crack it. Oracle doc explains as below

"On import, requisition lines are grouped first by requisition header number, then by the provided Group Code, then by the value set in the Group-by input parameter (None, Buyer, Category, Item, Location, or Supplier)."

But i'm having difficulty when i'm using Group Code in FBDI in conjunction with Group-By as Supplier, as i observed varied outputs.