D365 Finance & Operations and Dynamics AX Forum

  • 1.  Using Lead Time functionality & MRP

    Posted Jul 15, 2016 09:49 AM

    Hello, we were advised that we could use the Lead Time functionality in Item Coverage to manage the below requirement, but it does not seem to work as desired:


    If we have an item requirement due on a Friday (i.e. sales order requirement to customer), we want MRP to plan to complete the production order on Wednesday, so that we have a day to bundle/build the load and a day to have the truck deliver the load. We entered a Lead Time on Production of 2 working days, as shown below, but there is no change in how MRP plans the order. Is the functionality of the Lead Time in Item coverage different than what was described to us? Is there another way to achieve the desired scheduling scenario outlined above?

    Thank you,

    Brian

    b4bwreSISdKIDe1SaPpV_lead time.jpg

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    Brian Herzog
    Contech Engineered Solutions

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  • 2.  RE: Using Lead Time functionality & MRP

    TOP CONTRIBUTOR
    Posted Jul 15, 2016 10:51 AM

    Inside the capacity time fence AX uses the lead time calculated from the route on the item. Review your coverage group that's applied to the item and see if their is a capacity time fence defined. Released Product -> Plan Fast tab -> Coverage Group -> Right click view details -> Other fast tab. 

       You can also over-ride the coverage group's capacity time fence on the Master Plan by checking the override checkbox and entering a differing amount of days.  You could check the over-ride and set it to 0 here, then your Item coverage lead time will take effect.  Note this will affect everything that runs through this master plan, so try it out in a test environment first or create a separate plan and run it just for your item. 

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    Colby Gallagher
    Manufacturing Systems Consultant
    Agility Business Solutions
    Brecksville OH



  • 3.  RE: Using Lead Time functionality & MRP

    Posted Jul 15, 2016 11:57 AM

    Thank you for the reply. The scenario I tested is:

    - Item coverage capacity time fence and explosion time fence set to 20 days

    - production lead time set to 2 days

    - item run time of 1 hour per unit

    - sales order for 3 units due 7/29

    My planned production order thus states a start time of 7AM and end time of 10AM, all occurring on 7/29. We want the planned order to state 7/27 as the scheduled production end date. So essentially we want to bump forward the planned production order by two days. This would allow 7/28 for bundling/packaging the product and 7/29 for the truck to pick up and deliver. It seems there is another setting I am missing in order to have the planned order come through in this manner.

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    Brian Herzog
    Contech Engineered Solutions



  • 4.  RE: Using Lead Time functionality & MRP

    TOP CONTRIBUTOR
    Posted Jul 15, 2016 01:06 PM

    Set your receipt margin at 2 days on the master plan or the coverage group.  

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    Colby Gallagher
    Manufacturing Systems Consultant
    Agility Business Solutions
    Brecksville OH



  • 5.  RE: Using Lead Time functionality & MRP

    Posted Jul 18, 2016 08:43 AM

    Thank you, this is what we were looking for!

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    Brian Herzog
    Contech Engineered Solutions



  • 6.  RE: Using Lead Time functionality & MRP

    Posted Jul 18, 2016 10:03 AM

    There are two separate parts of this issue/topic. The first affects the planned release date for the order, or when you'd normally "firm" it and kick off production. That's affected by the item coverage settings you're showing, so you should probably notice that the order date is correctly winding up about 2 days ahead of the planned receipt date.

    The suggestions to add receipt margin days would affect the planned receipt date, advancing it ahead of the higher level requirement (in this case the sales order). So, for example if you have a margin day of 1 and item coverage of 2 with a sales order due on a Friday, the planned production order would be scheduled for close of business Wednesday, and an order date of 2 days earlier--start of business Tuesday.

    The second issue, though, is the routing steps and scheduling of the work being performed. That's a little harder to establish a fixed leadtime, and is generally a bad idea to try to do so. There are several ways to affect this, including tinkering with capacity time fences, turning on/off finite planning, using queue times, etc.

    What you need to ask yourself is why it's necessary to set a fixed two-day leadtime. Is it because you're not comfortable with the scheduled operations taking so little time that you want to add a buffer? Is it because you're not comfortable with the results of the routing sometimes blowing up and taking too long or not finding available capacity? Is it because the operation steps appear too "lean", with insufficient buffers between process steps? Understanding what root problem will help determine the best approach towards solving this.

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    Chan Stevens
    Industry consultant
    Cincom Systems
    Cincinnati OH



  • 7.  RE: Using Lead Time functionality & MRP

    Posted Jul 18, 2016 01:41 PM

    Chan,

    Thank you for the reply. The reason for wanting the production order to end 2 days ahead of time is simply for time for the truckload of product to be packaged/bundled without requiring a step in the production route for this operation. This way, the product can be in the storage yard by COB Wednesday, and the picker/packer can use the load slip to bundle the items on Thursday, with the truck arriving on Friday to be loaded.

    Almost all of our products have a short production lead time of less than 1 day. The only items that we are using queue time for are fabricated items that require the short lead time items as part of the BOM. On these, we put a queue time in to set the date of when the BOM items need to be available. So if we want 2 weeks in the fab department, we put 240 total hours of queue time in the route, so that the BOM items are scheduled before the start date on the fab production order. With fab items being snowflake items, we input different queue times for each item when creating the part number, BOM, and Route based on complexity of the item.

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    Brian Herzog
    Contech Engineered Solutions



  • 8.  RE: Using Lead Time functionality & MRP

    Posted Jul 19, 2016 10:10 AM

    Brian:

    The only distinction I was trying to draw between the order start date (item coverage) and job/operation scheduling dates (queue times) is that they affect different things, and in your example if you want the material components scheduled earlier, for example, that's definitely item coverage solution, but if you want the people that perform the work to do the work sooner, as opposed to a zero queue last minute scenario, then you'd need to make sure they get their marching orders and priorities from something basic like order date data rather than resource-oriented data like dispatch reports or production schedules. Sometimes you' need to tweak both the item coverage and the routing data if you want the production schedules and component schedules to be in alignment.

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    Chan Stevens
    Industry consultant
    Cincom Systems
    Cincinnati OH



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