Master Recipe Scheduling (SAP Library - Master Recipes (PP-PI-MD))

Master Recipe Scheduling

Purpose

You can use recipe scheduling to get an early overview of how individual process steps are related to each other in terms of time. If required, you can use the scheduling results to update the in-house production time in the master record of the material you want to produce.

Recipe scheduling is carried out as lead time scheduling that simulates a process order for the corresponding recipe. Unlike the scheduling of process orders, the system does not yet calculate capacity requirements.

Prerequisites

The scheduling-relevant data has been edited in the master recipe and in the resources and materials used. This includes:

In the header material of the master recipe

Floats before and after production

In the resources of the master recipe

The standard value key and the rules for maintenance for the standard values
The capacity category that serves as the scheduling basis
A formula for the scheduling basis, which is used to calculate the processing time
The operating time of the scheduling basis, that is, available capacity, standard available capacity, and intervals of available capacity

In the master recipe

The control keys for the phases and secondary resources including information on their scheduling relevance
Relationships that determine how phases relate to each other in terms of time
For internally processed phases, standard values, the formulas for material quantity calculation, and any user-defined fields whose values are used to calculate the processing time
For externally processed phases, the vendor’s planned delivery time or - depending on the control key settings- the same data as for internally processed phases.
For secondary resources, the earliest and latest dates

Process Flow

You start the scheduling function.

In doing this, you specify the scheduling type and the scheduling-relevant data of the process order to be simulated.

The system calculates the scheduled start or finish dates of the master recipe according to the scheduling type you have entered.

Scheduling Type	The System Determines	Starting from
Forward scheduling and "today" scheduling	The scheduled start date of the master recipe	The basic start date and float before production
Backward scheduling	The scheduled finish date of the master recipe	The basic finish date and float after production
Only capacity requirements	The scheduled dates of the master recipe	Both basic dates as well as float before and after production

The system determines the phase dates as follows:

Scheduling Type	The System Determines the Phase Dates
Forward and backward scheduling, and "today" scheduling	For internally processed phases, using the following data: The processing time determined from the formulas for the scheduling basis of the resource The scheduled recipe dates The relationships The operating time of the resource For externally processed phases, using the following data: The planned delivery time for the phase The relationships The Gregorian calendar Exception: Externally processed phases are scheduled in the same way as internally processed phases if their control key specifies scheduling using standard values.
Only capacity requirements	By transferring the scheduled recipe dates

The system uses the following dates as the operation dates:

Scheduling Type	The System Uses
Forward and backward scheduling, and "today" scheduling	The start date of the first phase as the operation start date The finish date of the last phase as the operation finish date
Only capacity requirements	The scheduled start date of the master recipe as the operation start date The scheduled finish date of the master recipe as the operation finish date

The system determines the secondary resource dates as follows:

Scheduling Type	The System Determines the Secondary Resource Dates
Forward and backward scheduling, and "today" scheduling	Using the following data: The operation or phase dates The planned offset between the operation or phase dates and the dates of the secondary resource
Only capacity requirements	By transferring the scheduled recipe dates

The system determines missing basic dates as follows:

Scheduling Type	The System Determines	Starting from
Forward scheduling and "today" scheduling	The basic finish date of the master recipe	The scheduled finish date and the float after production
Backward scheduling	The basic start date of the master recipe	Scheduled start date and the float before production

If you have entered the start and finish dates when you started scheduling, the system checks whether the scheduled dates are within the specified period of time. If they are not within this period, it writes an entry into the scheduling log.

The scheduling results are displayed in the scheduling overview.

If required, you can display the results in a Gantt chart or compare them with the dates defined in the material master on the Scheduling Results screen.

You go to the scheduling log to analyze the errors that may have occurred during scheduling and correct them.
If required, you transfer the scheduled lead time to the material master record of the header material as the lot size dependent in-house production time.