"Actual" value in FO type B

Hello,

Could you please explain to me why how does the actual value work in FO type B, as i have the actual value bigger then the value of invices receipt.

I thought the values should be the same?

Why does the "actual" value not correspond to the invoices posted with ref. to the blanket purchase order FO with limit.?

What can be the reason?

Regards

Thank you in advance