in the "Pull From List" it's necessary to updated query to choose right rack (WHERE Type = puller.Type AND Rack = puller.Rack).
In particular, the field "Rack" in "Inventories_list" is a object.So in the section "Pick Creation" of process flow, when you assign labels to picks, token.Rack has to be a link to a Object, using function Model.find(...), as you used in the "Create Object" code.
In the simulation it is impossible to satisfy the first picking request because the requested type is not present in the desired rack.
Attached you will find the model with the additions.
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