How to Fetch data of Items Available to promise from SAP b1 Service layer using API ?

Hi Expert ,

Previously i had used Item Available to promise data from SAP B1 using DI Server using ExecuteRawQuery api of DI Server.I am using now SAP B1 Service Layer . I can't find any API for ServiceLayer in below URI of Service Layer :

https://Myserver:50000/Service%20Layer%20API%20Reference.html

Please give me suggestion how can i get available to promise data from SAP b1 using ServiceLayer API.

Thanks & Regards

Surajit Kundu