I have done the customization setting for CTP.
While creating a sales order system shows ATP screen, in which it shows when the material will be available. After saving the order in R/3, I could see the same sales order in APO with Required quanity Zero and No Plan order is created in APO.
So I have to again go to VA02 for the same sales order and again I have to carry out Manual ATP check. After saving now again I could see PlOrd (F) in APO.
But sales order loses its confirmation. When ever I see the sales order the Confirm quantity is alway Zero and hence couldnt give Confirm Delivery date to sales order.