Extraction method for purchasing info

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Hi all!

I need some help with this (see the infosource section)

[http://help.sap.com/saphelp_nw70/helpdata/en/ed/62073c44564d59e10000000a114084/frameset.htm ]

as you can see the document says you can choose one of two methods of extraction. Could you tel me the more important differences between them?. Why Purchasing Groups (2LIS_02_S011) isn't included in LBWE? Which one do you recomend?

Bonus track...

Doesn't "Purchasing BI Content" take into account any info on Purchasing Requisition? The user needs to analyze times between the creation of Purchasing Requisition and the creation of the related Purchase Order... Am I clear?

We've seen that all queries, cube's and ods's are meaningful once the Purchase Order have been created, are we right?.

Thanks a lot!!!!.