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I get the concept of negative and positive days, but I have settings of 100 positive days and 100 negative days. I keep getting a planned purchase order (in this case) that falls on 4/19, but I have an existing purchase order on 4/20 (current date is 3/2). I do see action messaging (which I haven't done much with) that is different. Move in 59 days for the existing order and move in 51 days for the PPO. Could that be causing the PPO to fall inside my existing PO?
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Do you raise POs more than 100 days in the future?
Positive days is the immediate window in which master planning will assume you want to reserve inventory for demand that is expected to arise within that window For alter demand it will not allocate stock to that future demand but it will trigger a new PO in the future.
To consider actual on-hand for any demand, the positive days have to be at least as long as the coverage fence. Higher than needed positive days generally are not generally a problem - but don't leave it blank or mrp will ignore on hand stock.
Negative days will look to see whether a PO can be brought forward rather than create a new PO. However, it does not know whether that PO can be changed - its a contractual commitment and may have already been shipped by sea. So the system will plan a new order to cover a short term demand, but will also give you a message to recommend you cancel it and instead advance an existing order.
If you are using high numbers like 100, then its very important to review Action messages.
dynamics negative days is generally a better option and is based on lead time.
Negative days then can be considered more as a minor extra tolerance on the dates which you can live with.
Note negative days when used to replenish minimums don't; have a vendor lead time, so will take the default LT from the product master which may differ for a specific vendor or not be realistic for production when the production quantity is high.
Coverage code - Period
Coverage Period - 21
Coverage time fence - 365
Negative days - 100
Positive days - 100
Requested Production status - Scheduled
Firming Time Fence - 0
Freeze Time Fence - 0
Explosion Time Fence -180
Capacity Time Fence - 180
Approved Reqs - 0
Forecast plan time fence - 100
Reduction key - 7.day
Reduce forecast by - Orders
Receipt/Issue/Reorder Margin - All 0
Action time fence -100
Postpone message - 0
Advance margin - 0
Basis date - requirement date
Advance/Postpone/Decrease/Increase/Derived Actions - All checked
Futures message - checked
Futures time fence - 100
I'm not sure I follow on the 100 days question. We are trying to get to a place where we manage purchase orders. So if master planning recommends that we need a new purchase order, we would prefer to pull in an existing order rather than generate a new one.
I'm not sure I follow on the 100 days question. We are trying to get to a place where we manage purchase orders. So if master planning recommends that we need a new purchase order, we would prefer to pull in an existing order rather than generate a new one.
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