Perform Site MRP
Explanation
This activity is used to calculate supply and demand for MRP planned
parts, based on existing shop orders, customer orders, etc. The system
creates MRP-planned proposals for fulfilling these demands, such as purchase
or shop order requisitions. It also creates suggestions to replan existing
supply orders, considering projected material availability.
Planned supplies and action messages generated in previous MRP processes
will be removed as first step in the calculation.
More detailed descriptions of Material Requirement Planning can be
found in following documents:
About MRP
About messages from MRP
About the phases of MRP
About Alternate Components in MRP
Prerequisites
- BOMs must have been defined for the parts, and lead times for both
purchased and manufactured parts must have been established. MRP only
uses the existing product structure with the alternate " * " indicated
by an asterisk(*).
- To perform MRP for master scheduled parts you must first have created
a master production schedule using IFS/Master Scheduling.
- To perform MRP for project planned parts you should first run PMRP.
- To perform MRP for DDMRP buffered parts must have been positioned using
the planning method H, also buffer zones and buffer levels must have been
established.
Note: MRP does not process parts with planning methods B - Order Point
Planning, C - Replenishment Level, M - Manufacturing Cell Part or N - Next Level
Demand.
System Effects
- After this process is executed, the Warning or Error status can apply.
Error indicates that some critical errors have occurred in the process,
and the MRP process has stopped. Warning indicates that a message posted
for this process has to be reviewed by the user. This can be done by using
the Show Details command on the
Background Jobs
page, which displays the message in the status information
table. If the user decides to continue the MRP process, the MRP process
will display error messages when the process is completed.
- MRP calculation will consider inventory parts for which the MRP Control
option is enabled on
Manufacturing tab on the
Inventory Part page.
- MRP will generate shop order requisitions or non-firm production schedules
for parts that are defined as manufactured, and it will generate purchase requisitions
or supplier schedules for parts that are defined as purchased. For parts
defined as remanufactured it will generate shop order requisitions.
- Shop order requisitions and purchase requisitions that are not
converted into shop orders or non-firm production schedules will be
deleted upon starting the next MRP process. MRP calculates the lowest level code of parts
and updates the Low Level on the
Inventory Part/Manufacturing tab.
- For buffered parts (using planning method H, Buffered Part) MRP planned
supplies are created without considering the future demands but
considering open supplies, on hand quantities, demands due today, past
due demands and qualified order spikes. Qualified order spikes are
demands that fall within the order spike horizon and which equal or exceed the
order spike threshold.