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Specifying Fixed Date and
Quantity 
In certain cases, the results of the availability check for an item are such that a full delivery is not possible on the requested delivery date. In this case, the system creates one or more confirmation schedule lines with partial quantities and/or for later delivery dates. If the customer can accept these quantities and delivery dates, you can set the Fixed Date/Qty indicator in the sales transaction item.
This causes the requirements to be reduced to the confirmed quantities. That is, the confirmed quantities, not the requested quantities, are transferred to the ATP system. This can help to reduce pressure on production. This indicator can also be taken into account during backorder processing.
You can set this indicator in Customizing for Customer Relationship Management under Transactions ® Basic Settings ® Define Item Categories on the General tab. It is proposed in the sales transaction item when you create it. This indicator is located in the People-Centric UI on the Products tab, in the SAP GUI on the Schedule Lines tab.