0FC_BP_ITEMS: ERP customizing and delta mechanism

Hi BI fans

I have two questions:

1.) The following link describes how to make the settings for delta enabling of datasource 0FC_BP_ITEMS:

http://help.sap.com/saphelp_nw70/helpdata/en/27/42073e774a4329b6dd6bab21eef613/frameset.htm

Prerequisites-

"...If you want to use the delta method, you first have to activate it in the Implementation Guide for Contract Accounts Receivable and Payable ->  Integration Business Intelligence -> Maintain Central Settings in the clients of the OLTP system..."

But I cannot find the setting for "Maintain Centrall Settings" in the implementation guide!

Any idea from your side?

What I see are entries for:

Define Fields for the Extraction of Items

Define Grid for Grouping of Items

2.) What is the exact delta logic of this extractor (working through function module)?

Which fields are relevant for the delta logic?

Thanks

BEOplanet