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MRP processes

Open window MRP Regeneration
Manufacturing >> Transactions >> MRP >> Regeneration



Use the MRP Regeneration window to set the bucket size for MRP (Material Requirements Planning) calculations, to initiate the MRP calculation process, and to generate exception reports that identify item shortages and past-due orders.



MRP processes determine what records are included in each instance of MRP calculations.

You can use the MRP Regeneration window to specify an MRP process. 

MRP processes include:

Full regeneration   A full regeneration is complete recalculation of MRP data, including all sales orders, all purchase orders, sales forecasts, and all manufacturing orders. You must complete a full regeneration of MRP the first time you calculate MRP, but after that you can to use a “net-change” regeneration.

When calculating MRP quantities, the requirements for made items are exploded—their component requirements also are calculated—and purchase and manufacturing orders are suggested to cover the potential shortages

Net regeneration   A net change MRP regeneration updates MRP information based on changes to manufacturing orders, sales orders, purchase orders, inventory quantities, item resource planning values, MRP exclusions, and picklists.






Regenerating MRP information

Use the MRP Regeneration window to update MRP information. Before you regenerate MRP information for the first time after upgrading Manufacturing or adding manufacturing records directly into SQL tables, you should generate low-level codes. Refer to Generating low-level codes for more information.
To exclude items, sites, or item-site combinations from MRP planning, refer to Excluding items and sites from MRP calculations.

To regenerate MRP information:

  1. Open the MRP Regeneration window.
    (Manufacturing >> Transactions >> MRP >> Regeneration)
  2. In the Run for field, specify how far into the future MRP information should be calculated. Enter a number and select days, weeks, or months.
  3. Mark buckets to determine how MRP information will be displayed. Days must be one of your choices. The more options you mark, the longer MRP processing will take.
  4. From the Regeneration Type list, select a type of MRP process. If you select Full Regeneration, the system will calculate all MRP requirements through the period you’ve defined.
  5. Choose Process to begin the MRP regeneration process. Information from the MRP regeneration process will be saved automatically.
When you choose Process, all of the MRP–planned manufacturing orders—the manufacturing orders that are included in the Capacity Requirements Planning windows when the Show MRP planned orders option is marked—will be removed from the CRP tables.
If the Other Transactions option is marked in the Inventory Control Setup window, expired lots are included when calculating the quantity that will be available on a specific date. If the Other Transactions option isn’t marked in the Inventory Control Setup window, expired lots aren’t included in the calculation.
If you encounter a recursion error during routine MRP use, you might need to regenerate your low-level codes—the codes that track the lowest level use of an item in any bill of materials to make MRP calculations more precise. Refer to Generating low-level codes for more information.

  1. When MRP regeneration is complete, the MRP Exception Report will be automatically generated if there are exceptions—item shortages or past-due orders—to report. Otherwise, a message will appear to tell you the process is complete.
The exception report is just one method that’s available for viewing information about MRP calculations. You can start with that report to begin work to prevent shortages from occurring. Refer to Handling an MRP exception and Interpreting exception messages for more information about the exception reports.




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