Backorders not sorted properly

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Thomas JR asked Oct 29, '20 Thomas JR commented Oct 30, '20

Backorders not sorted properly

I've created a small model to test if the backorder queue strategies in my main model work as expected. Basically I have three sources, each spawning a single token. Each token request the exact same 3D-object (a bed). The first token (Source 1) pulls the object. Then two more tokens arrive that request the same object, thus two backorders are created. Source 2 arrives 1 second before Source 3.

I have created the backorder queue strategy for "Beds" as "ORDER BY Arrivalday DESC". The tokens of sources 1, 2 and 3 have arrivalday 1, 2 and 3 respectively.

I expected the token of Source 3 to pull the object after it has been pushed back to the list, but instead it is pulled by the token of Source 2.

Backorder_queue_strategy_issue.fsm

Software Version:

FlexSim 20.2.3

flexsim 20.2.3 global list backorder queue strategy

backorder-queue-strategy-issue.fsm (43.4 KiB)

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Answer 1 · 2020-10-29T16:57:58Z

Matthew Gillespie answered Oct 29, '20 Thomas JR commented Oct 30, '20

You should read the documentation on the Back Order Queue Strategy field.

You need to either add a Puller. in front of Arrivalday

ORDER BY Puller.Arrivalday DESC

OR add a field on the list with the expression set to Puller.Arrivalday.

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Thomas JR commented · Oct 30, 2020 at 09:39 AM

@Matthew Gillespie

Thanks. My bad, I actually already read the documentation but it completely slipped off my mind when working out the test-model.

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