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Quota Arrangement in Heuristic - how to fix this odd behavior

I create QA for internal 70% and external procurement 30%. Max lot size in product master is 500 for lot sizing EX and procurement type X.

When I enter a demand for 100, the system create a purchase req for 30 but instead of creating one snp plannned order, it is creating two as follows:

70% of remaining 70 = 49 and the rest (70-49) = 21 both using the same PPM 1. I think the system is coming to PPM source of supply and first reads 70% quota against it then does the above calc.

My expectation is 30 for external and one order for 70 for inhouse.

If I remove the max lot size I get the expected result.

But this does not sound logical.


external proc: 30%

inhouse production: 70% PPM 1

for a demand qty of 600, i get a preq for 180 but the remaining 420 is again split as 350 and 70 for the same start finish dates and the PPM 1.

Any ideas?

Here is the 'original scenario'.

I am trying to model make/buy using Heuristic. I can produced a max of 500 per week, above that I want to auto-generate a PR on a vendor.

If you know of a most efficient method to accomplish this using background processing with least subsequent interaction, please let me know.

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  • Posted on Apr 30, 2012 at 04:08 PM


    The SNP planned order split might be due to available capacity, please check the capacity requirements based on the PPM but not based on the QA percentage. It is quite evident from your example with demand quantity 600.

    As you mentioned, you want to first use in-house procurement and go for external procurement only if demand exceeds the in-house supply capacity. In that case, don't use QA but manage with procurement priorities.

    Please check the following links on source of supply determination and ranking for details.


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    • Former Member Rajesh Jagadeeswaran


      I agree that Heuristic isn't going to solve this problem effectively. I was trying to see if anything could be done to ease the planning effort if a client chooses to implement it.

      However, I still think the behavior to split is odd.

      Heuristic is infinite planning so it can't be the capacity constraint.

      Second, if I plan for 100 I get 49 and 21.

      If I plan for 600 in the same bucket, I get 350 and 70.

      This means its not the capacity issue because it scheduling one order for 350 but in the first case it is splitting an order of 70. I also notice capacity leveling is giving incorrect error. I think it's a system patch issue than anything else.

      Thanks for your insights.

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