Signaling Differing Supplier Confirmations
You can use this function to display differing supplier confirmations in the sales order. For example, quantities or dates confirmed by suppliers do not match the quantities and dates requested in the sales order.
Prerequisites
To enter differing supplier confirmations in the purchase order, you have made the settings necessary for confirmation control in SAP ERP. You can find further information in Customizing, at 
Materials Management
Purchasing
Basic Functions
Confirmations
Set Up Confirmation Control
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Features
Deviations can be caused by changes to quantity, postponement of the desired delivery date, or cancellation of order items. The system compares the quantities and dates confirmed by the supplier, with the quantities and dates requested by the customer and if necessary, produces a warning message and stores corresponding confirmed quantities and dates in the sales order. For this, the system checks the following:
Does the confirmed quantity differ from the purchase order quantity?
Does the next closest confirmed delivery date fall before the desired delivery date?
Activities
If the system produces a warning message after the check, you can contact the customer, the supplier, or both. You can clear the warning message by:
Adjusting purchase order quantities or desired delivery dates to match the supplier confirmation
Receiving a revised confirmation from the supplier
Example
A customer orders 20 tires for August 15th. A purchase order is sent to the supplier. The customer later reduces the quantity to 10 tires, and specifies that he or she does not want them to be delivered until August 31st. The changes are sent to the supplier, but he or she rejects them and sends a confirmation for 20 tires. Due to limited storage, the supplier confirms 10 tires for August 15th, and 10 tires for August 31st. If the customer accepts the supplier confirmation, the changed customer data is reset in the sales order, and adjusted to the supplier confirmation. If the customer does not accept the supplier confirmation, the supplier can send a new confirmation that is adjusted to incorporate the customer's changes.