1. A method for resolving a purchase order confirmation including a deviating quantity using a computer implemented business information system, comprising: receiving, by a purchaser from a supplier, the purchase order confirmation, the purchase order confirmation including the deviating quantity of a product; determining, at the time the purchase order confirmation is received, a purchaser existing stock availability for the product using a dynamic purchase ordering functionality module of the computer implemented business information system; presenting both the purchase order confirmation and the purchaser existing stock availability to the purchaser in an integrated computer display; and selecting one of a plurality of resolution options using both the purchase order confirmation and the purchaser existing stock availability to resolve a deviation between a requested amount of the product presented in a purchase order and the deviating quantity, wherein the plurality of resolution options includes: making up for a gap between a purchase order quantity of the product and the deviating quantity using the purchaser existing stock availability as a function of accepting the purchase order confirmation; and generating a new purchase order to a second supplier as a function of accepting the deviating quantity in the purchase order confirmation and as a function of the gap between the purchase order quantity of the product and the deviating quantity.