"Order Pair has a first order with an anchor first/last AssignmentRule." solver failed

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01-22-2022 03:47 PM
IhabElAttar
New Contributor II

Hello,

I am using the REST VRP endpoint to dispatch a fleet. I sent the request below with an order pair and set the assignment rule of one of the two stops to "anchor first. "

 


"token":"zt6JOhfF2mRM1drL8dI23Z3RiD8V4cm8k4yVu7C1oIZbZtUDU8lvIXXf-bCK9DbXuy5Yu7rn5rrwsHN3g0vz3_Y8Wx5S1wj2rVjPDv0TKIHrHPKBsGfrZrwRw6ew23MTYJG5HJ-u8CYQEJpMwH713w..","default_date":1640093520000,"f":"json","travel_mode":"CUSTOM","distance_units":"Kilometers","time_units":"Minutes","time_zone_usage_for_time_fields":"UTC","excess_transit_factor":"Low","populate_directions":true,"directions_style_name":"NA Navigation","restrictions":"[\"Avoid Carpool Roads\",\"Avoid Toll Roads\",\"Avoid Gates\",\"Avoid Private Roads\",\"Avoid Unpaved Roads\",\"Driving an Automobile\",\"Roads Under Construction Prohibited\",\"Through Traffic Prohibited\"]","attribute_parameter_values":"\"features\":[\"attributes\":\"AttributeName\":\"Avoid Toll Roads\",\"ParameterName\":\"Restriction Usage\",\"ParameterValue\":\"PROHIBITED\"]","time_window_factor":"medium","depots":"\"features\":[\"geometry\":\"x\":\"-79.722066000\",\"y\":\"43.693962000\",\"attributes\":\"Name\":\"4307\"]","orders":"\"features\":[\"geometry\":\"x\":\"-79.5007\",\"y\":\"43.813\",\"attributes\":\"Name\":\"D-8394672\",\"DeliveryQuantities\":\"1 200 48 48\",\"ServiceTime\":null,\"TimeWindowEnd1\":1640107200000,\"RouteName\":null,\"AssignmentRule\":null,\"Sequence\":null,\"TimeWindowStart1\":null,\"geometry\":\"x\":\"-79.6874\",\"y\":\"43.6386\",\"attributes\":\"Name\":\"P-8394670\",\"PickupQuantities\":\"6 1000 0 0\",\"TimeWindowStart1\":1640092800000,\"ServiceTime\":\"10\",\"TimeWindowEnd1\":1640124000000,\"RouteName\":\"4307\",\"AssignmentRule\":\"4\",\"Sequence\":null,\"geometry\":\"x\":\"-79.4508\",\"y\":\"43.8704\",\"attributes\":\"Name\":\"D-8394670\",\"DeliveryQuantities\":\"6 1000 0 0\",\"ServiceTime\":null,\"TimeWindowEnd1\":1640107200000,\"RouteName\":\"4307\",\"AssignmentRule\":null,\"Sequence\":null,\"TimeWindowStart1\":null,\"geometry\":\"x\":\"-79.4874\",\"y\":\"43.8187\",\"attributes\":\"Name\":\"P-8394671\",\"PickupQuantities\":\"4 1200 60 48\",\"TimeWindowStart1\":1640095200000,\"ServiceTime\":null,\"TimeWindowEnd1\":1640122200000,\"RouteName\":null,\"AssignmentRule\":null,\"Sequence\":null,\"geometry\":\"x\":\"-79.3787\",\"y\":\"43.8531\",\"attributes\":\"Name\":\"D-8394671\",\"DeliveryQuantities\":\"4 1200 60 48\",\"ServiceTime\":null,\"TimeWindowEnd1\":1640124000000,\"RouteName\":null,\"AssignmentRule\":null,\"Sequence\":null,\"TimeWindowStart1\":null]","routes":"\"features\":[\"attributes\":\"Name\":\"4307\",\"StartDepotName\":\"4307\",\"MaxOrderCount\":\"99\",\"EarliestStartTime\":1640091600000,\"LatestStartTime\":1640091600000,\"Capacities\":\"12 12000\",\"CostPerUnitTime\":\"0.42\",\"CostPerUnitDistance\":\"0.95\",\"MaxTotalTravelTime\":null,\"MaxTotalDistance\":null,\"FixedCost\":null]","order_pairs":"\"features\":[\"attributes\":\"FirstOrderName\":\"P-8394670\",\"SecondOrderName\":\"D-8394670\",\"attributes\":\"FirstOrderName\":\"P-8394671\",\"SecondOrderName\":\"D-8394671\"]"
 
When I post this request to ArcGIS Online, I get the error below. why is it not possible to set the assignment rule to "anchor first" to one of the orders in a pair ? 
 

Solver Failed with the following Warnings : ["type":"esriJobMessageTypeWarning","description":"Order Pairs
(FirstOrderName = \"P-8394670\", SecondOrderName = \"D-8394670\") has a first order with an anchor first/last
AssignmentRule.","type":"esriJobMessageTypeWarning","description":"WARNING 030092: VRP Solver failed due to invalid
input.","type":"esriJobMessageTypeWarning","description":"Invalid input in the NA classes."]
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1 Reply
HeatherMoe
Esri Contributor

I can add this to our list of enhancement requests to consider. A bit of detail about the workflow or situation you are trying to accomplish with this would be helpful. Also, in your particular use case do you typically have multiple orders at the exact same location where that anchored first order might be at the same location as others such for school bus routing where several students start at a school and get dropped of back at their home bus stops. 

 

In the mean time you could perhaps use a short time window that starts at the beginning of the route start time to encourage the solver to go to that order first. 

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