Task sequence problem in Process Flow - Robot picking up an item form other queue

[lcdiazM6QFX]

Hello,

In my FlexSim model, in the ProcesFlow called ProcesFlow_emparejamiento, the Robot (placed in TALLER: EMPAREJAMIENTO) has to talke one CONO, COPA and RODILLOS with the same label value "Tol", which can be 1, 2 or 3, and one JAULA (without the label "Tol") and then join them in the combiner called Assembly. The model worked fine in very trials, but after some modifications not related to this Process Flow, it suddenly it stops working. It always happens around 6:07 am of 18/10/2025. The message is the one that I copy below, and what we see is that the Robot takes an item from the Queue "Bacthes of 20 to sell", with a "Type" label RODAMIENTO, which was not requested in the process flow. We don't understand why, we suppose we have a bug. 

The ProcesFlow_emparejamiento was done with the help of @moehlmann_fe.

Please, could you help us.

[FelixMoehlmann · Accepted solution]

This is caused by a rare bug where a pulled item stays on the list when pulled by a backorder (I don't know when/why exactly this happens). The item then gets pulled again later when it's actually already on the combiner.

You can fix this by activating the "Allow Multiple Pushes Before Back Order Fulfillment" option.

[lcdiazM6QFX]

Great, it works! Thank you for your fast response.