Open Forum

Expand all | Collapse all

Purchase Planning Lead TIme

  • 1.  Purchase Planning Lead TIme

    Posted 11 days ago
    Does GP use calendar days, work days or a shop calendar to determine PO release or promise dates. We use MRP and struggle as we are just in time made to order mfg.  We want to make sure that all of our teams are speaking the same language.

    If a supplier has a 90 day lead time we put 90 days in purchase planning lead time. Wil this calculate out to be approximate  3mth window or does it only use only work days and therefore will calculate out to 4.5 month window (5 day weeks).  Or is this all determined on the MRP shop calendar.

    ------------------------------
    Sabrina Burtlow

    ------------------------------
    Academy - Online Interactive Learning from Experts


  • 2.  RE: Purchase Planning Lead TIme

    GOLD CONTRIBUTOR
    Posted 11 days ago
    Hi Sabrina.
    I believe there is a setting that controls this.  Under Manufacturing >> Setup >> System Defaults >> MRP.  In the upper left you'll see a drop down called "Down Days Constraint".  This will tell MRP if you want release dates to consider the shop calendar down days for None of your items, just Made items, just Buy items, or Both.



    ------------------------------
    Andrew Kennedy
    Principal Consultant
    Velosio
    Seven Hills OH
    ------------------------------

    Academy - Online Interactive Learning from Experts


  • 3.  RE: Purchase Planning Lead TIme

    GOLD CONTRIBUTOR
    Posted 11 days ago
    Hi Sabrina,

    If you have a test environment, please test the settings. We use MRP extensively and use calendar days for all purchased items . This is industry practice for many manufacturers. The MRP down day constraint determines if an item's release date for MRP-planned orders will fall on a down date. I've included an example of settings and a purchased item showing the due and release dates. The shop calendar if 5 working days M - F.

    We tested this originally to ensure it handled the lead-times correctly, providing a release date on a work day but using the calendar lead-time. If the lead-time calculation fell on a down day, the release day backs up to the 1st prior workday.

    Hope this helps,
    Regards,,
    Keith

    Explanation


    Down Day Setting for Bought Items

    Calendar Days with down day constraint


    ------------------------------
    Keith Paul
    VP Business Management Systems
    UNICOM Engineering, Inc.
    Plano TX
    ------------------------------

    Academy - Online Interactive Learning from Experts


If you've found this thread useful, dive deeper into User Group community content by role