Comment 38 for bug 388145

I will test this above scenario tomorrow. Regarding your questions:
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I have confusion about this entry.
account 7095 = D 1,00 ← Type P/L – Price differences creditor (also called discounts creditor) should be a parameter.

I can get difference of amount but in which account I have to debit or credit it? Shall we add new accounting property for encoding price differences?
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the purchase invoice is generated at order time with the prices we did know at that moment.
The supplier is sending the official invoice, and we will compare them with our generated invoice. The fact in above example is that we have a diff between both invoices.
As supplier invoice is official, we have to correct our generated invoice and price diffs should be added with a new accounting line manually. The system can't generate this line for us , so we need to select the correct account for this price diff.
Same for the delivery cost line that was added by the supplier, it is a manual action to insert a new accounting line with selecting the correct account manually.

(BTW, if we don't agree with the supplier invoice the correct way to follow is a credit note in case of a refund or an extra invoice if we want to pay more)