Rescheduling date does not take into account the GR
Processing Time
If you look at MD04, the rescheduling
date is based on the Stocks Requirement date.
It does not take into account the parameters in Procurement and Scheduling in
the Material Master.
In the net requirements calculation, the system checks whether warehouse stock
or firmed receipts are available to cover requirements. If a material shortage
exists, the system usually creates a new procurement proposal.
The rescheduling check is used to change the dates of
already existing firmed receipts not planned on the same day as the
requirement to suit the requirement date.
For this purpose, the system displays the appropriate exception messages with
rescheduling proposals for these firmed receipts to be processed by the MRP
controller.
You defined the rescheduling parameters in Customizing for MRP.
An important parameters is the rescheduling horizon
period to be included.
1. OPPQ per plant to Carry out overall
maintenance of plant parameters.
2. OPPR per MRP group to Carry out overall
maintenance of MRP groups.
You can also define tolerance values for the
creation of exception messages.
These values define a time period in which no exception message is to be
created, despite the fact that a rescheduling proposal may exist.
The MRP controller can thus avoid a situation where too
many exception messages are created if a certain buffer has already
been planned for scheduling basis dates.
Rescheduling Exception Proposal
Bring process forward (reschedule in)
Within this rescheduling horizon, the net requirements calculation
checks whether, after a requirement, a firmed receipt exists, which can be used
to cover this requirement. Then the system displays a rescheduling date as well
as the exception message Bring process forward for this receipt. The net
requirements calculation then uses this receipt and the
system will only create another procurement proposal if the receipt quantity is
not sufficient to cover the complete requirement. Several firmed receipts can be
used to cover one requirement.
The rescheduling horizon is always calculated from the
MRP date.
Postpone process (reschedule out), or cancel process
The net requirements calculation checks over the complete time axis whether
availability could still be guaranteed without the receipt in question. If this
is the case, the system checks whether the receipt planned here could be used to
cover a future requirement. If the system can find such a requirement, it then
displays a rescheduling date as well as the exception message Postpone process
for this receipt.
If the system finds no future requirement, for which the receipt is required,
the system displays the exception message Cancel
process.
