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 CTP with Production Directly

Use

If you have made the setting Production Directly in the check instructions , the system performs a net requirement calculation instead of an availability check. The net requirement calculation determines surpluses which can then be distributed to the requirement currently being checked. If the system cannot find any surplus receipt elements, the production planning is carried out exclusively for the requirement currently being checked. The system then creates a new receipt element and assigns it to the requirement.

You can specify whether or not the system is to take existing receipt elements that have already been otherwise assigned but are suitable from the date/time viewpoint into account in the CTP check and assign them if necessary, i.e. perform a redistribution of receipt elements .

Integration

  • If the Production Directly indicator has been set, the system performs a net requirement calculation instead of the ATP check. For this reason, the system cannot use the scope of check and the ATP horizon in this form of availability check.

  • If planned orders are only created with the help of the CTP check, this may result in a random distribution of the planned orders over the time axis. This results in an unsuitable setup sequence. In the scheduling of the orders, a lot of small gaps may arise on the time axis, which cannot be filled using the Find Slot strategy as the new operations to be scheduled are often longer than the available slots. For this reason, you should carry out sequencing or sequence optimization for the planned orders created in the course of the CTP check from time to time. In the process, the system optimizes the setup sequence and tries to close the gaps between the orders. As a result, you obtain improved confirmation dates.

Prerequisites

  • You have made the setting Production Directly in the Start Production field.

  • If the system is to carry out a redistribution of existing, possibly already otherwise assigned receipt elements during the CTP check, you must set the Production Directly indicator in the PP Planning Procedure of the product to be checked.

  • You must enter an ABAP Class for CTP Processes under PP Planning Procedure . You can use the Redistribution for Products Directly in connection with the following ABAP classes only:

    • /SAPAPO/CL_RRP_CTP

    • /SAPAPO/CL_RRP_FIX

Features

Production Directly Without Redistribution of Receipts

If you work without the redistribution of the receipt elements, the system can assign only the surplus receipt elements to the customer requirement via the net requirement calculation in the course of the CTP check. If the existing receipts do not suffice, the planning creates a new receipt element for the checked customer requirement. Assignments that the system had already made in previous availability checks remain untouched. This means that even if a receipt element or stock that is suitable in terms of date/time exists, the system will not assign it to the requirement in question because it has already been assigned to another one. In this case, the system creates a new receipt element that may not necessarily be suitable with regard to date/time.

Production Directly With Redistribution of Receipts

If you have set the corresponding indicator in the PP Planning Procedure field, in the case of a new customer requirement, the system will check whether there is sufficient stock or a receipt element that is suitable in terms of date/time and, if so, assign it to the new requirement. It will do this even if the receipt element or stock was actually already assigned to another requirement. A prerequisite for this is that the planning is able to create another receipt element for the other requirement that is suitable in terms of date/time. Through the reassignment of existing receipt elements, it may be possible to achieve a better confirmation date.

Example

The following stock/requirement situation exists:

Date

Receipt/Requirement Element

Quantity

1.10.2005

Stock

100 pc

1.11.2005

Sales order

100 pc

A new sales order for 30 pc is created for 5.10.

Production Directly Without Redistribution

In the CTP check, production planning is invoked to create a receipt element for 30 pc for the date 5.10, as the existing stock cannot be used because the system has already assigned it to the sales order with the date 1.11.

However, due to capacity bottlenecks, the system can only create a planned order for 8.10. The new sales order is therefore only confirmed for 8.10.

Production Directly with Redistribution

In the CTP check, the system assigns 30 pc to the new sales order from stock.

The production planning is invoked for the date 1.11 to cover the missing quantity amounting to 30 pc. Because the system is able to create the planned order in good time, the missing quantity is available on 1.11.

The system can now confirm the new sales order as per the desired date (5.10).