Microsoft Dynamics AX (Archived)

ATP time fence v Purchase lead time

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Posted on by Liam Lawson

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Is there any reason why ATP time fence should not be set to the purchase lead time of the item - any thoughts on this?

Thanks

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Fredrik Sætre 12,644 on at

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Off the top of my head, there aren't anything wrong with that, but since you're asking the question this way I guess you can shed some light on the situation your self. Any experience with this?

My take on it would be that the purchase lead time will generate a planned purchase order as soon as the sales order is registered (assuming you use master planning and you don't have any stock or confirmed receipts within the timeframe).

If I remember correctly ATP don't take planned orders into account, so confirming the order and placing it will give you a receipt date. If you do it the same day, you won't see the order in your ATP before the next day... That is all. You won't be able to do an order confirmation before the next day if you immediately place the purchase order.

If you want the planned orders to show, you would need to run a CTP.

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Weaveriski 23,618 Moderator on at

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As a concept it is a good starting point, you would not want your ATP time fence to be less than the purchase lead time, however the ATP calculation will try to balance receipts and issues in its suggestion of an ATP date, meaning if for whatever reason you have orders exceeding the "default" purchase lead time the ATP would miss them and suggest the purchase lead time - not an issue although you have receipts which maybe constraint bound by the supplier and you need to take into account the receipt date and not the default lead time. That said if you had a PO that was due in in 15 days and a purchase lead time of 10 days ATP may say 10 days anyway because the system is configured to bring them in earlier if needed :-)

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Community Member on at

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We have been working through this issue and are looking at having a mod costed that will allow us to have the ATP time fence updated each night so that it accurately reflects the true supply lead time. So lets say you have an item that normally has a 60 day lead time (which we then use as the ATP days as well). You place an order and your supplier tells you they are running behind and actually can't supply for 95 days. In an excel table you put in the Item code (and potential site / warehouse code depending on what level your ATP settings are at), then the true supply date and the normal lead days / ATP days. This can then calculate what your ATP days should be every day, because your today date is an automatically updating formula. You then have a script / mod that runs each night and updates the ATP in AX based on what the table is calculating. Once there is no difference between normal ATP and Temporary ATP, the line gets removed from the table.

Item True Supply Date Today Date Normal Lead Days / ATP Normal ATP Difference Temporary ATP

Widget 101 1/08/2017 28/04/2017 60 27/06/2017 35 95

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guk1964 10,888 on at

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If you have no inventory for the item, then the assumption is that after the end of the ATP time fence you will have inventory. You might want also some safety time for: planning, QA, uncertainties in delivery/customs etc. This might be useful to set by Site, or even by items., for your A items (should not be needed for B and C items).

There is a good write op the logic here - https://technet.microsoft.com/en-us/library/gg212804.aspx

ATP itself can be calculated without use of mrp. If however, you update an item's lead time, every day, on , then it will affect all mrp related logic for that item i.e. all planned orders (unfirmed recommendations) will be affected, similarly you might have to rethink your positive and negative days, your time fences, and how many expediting messages you can live with.

You might find this video from Lachlan useful https://organicax.com/2015/06/19/effect-of-the-atp-time-fence-in-delivery-date-control/

T- Increase offer an extended ATP module see https://kurthatlevik.wordpress.com/2011/04/18/extended-atp-available-to-promise/

(NOTE: If you setup a non-manufactured product as CATP controlled, because CATP is not applicable, the system defaults back to the sales lead time, (not to ATP) .)

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