Availability Check
The availability check (ATP check) is when the system checks whether a product can be confirmed as available in a sales order (enough stock is available or can be produced or purchased on time). The product is reserved in the required quantity, and the ATP requirements are transferred to production or purchasing.
Note
You can also run the availability check as a simulation. This is called availability information. You can find more information under Availability Information.
You can perform the availability check using different systems and in different channels.
You can perform the availability check or obtain availability information using the following systems:
SAP Advanced Planning and Optimization (SAP APO)
You can find more information under Availability Check Using SAP APO.
SAP ERP Central Component (SAP ECC)
You can find more information under Availability Check Using SAP ECC.
External (non-SAP) systems
You can also use your own ATP system to carry out the availability check or obtain availability information.
You can find more information under Availability Check Using External Systems.
You set up the relevant system in Customizing under . You can activate the availability check at client level.
You can use the availability check in the following channels:
SAP CRM Web Channel
In SAP CRM Web Channel, you can use the availability check with SAP APO or the availability check with SAP ECC.
SAP E-Commerce for SAP ERP
In SAP E-Commerce for SAP ERP, you can use the availability check with SAP ECC.
Interaction Center
When you create or change a sales order and enter the product with the requested delivery date, SAP CRM transfers data to the ATP system that performs the availability check. The results of the availability check are returned to the sales order in SAP CRM.
You can also carry out the availability check manually by selecting the item(s) to be checked in the item overview’s edit mode and choosing .
Once you have created a sales order in SAP CRM, it consists of details data (also called header data) and one or more items. Each item has a requested delivery date and -quantity (figure 1). After the execution of the availability check, the system displays the results in the confirmed dates and quantities (figure 2).

You can see the availability of an item in the Items
assignment block in the Availability
column (figure 3). The system displays availability for sales orders saved in the SAP CRM back end and the SAP ERP back end using traffic lights.
You can find detailed information about requested quantities/-dates and confirmed quantities/-dates in the item in the Schedule Lines
assignment block.

For more information, see Schedule Lines and Structured Products in the Business Transaction.