Shipping by Rules for VirtueMart

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Miscalculation of shipping volumes 19 Jan 2017 10:08 #1

  • windcommerce
  • windcommerce's Avatar Topic Author
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  • Posts: 1
VirtueMart version: 3.0.12
Joomla version: 13.1.0
PHP version: 5.5.9-1ubuntu4.14
Webserver: Apache


we have some problems to calculate shipping costs because, by setting the volume calculation formula, the system inserts the shipping cost of a wrong price range.

The set rule is the follow:

Variable=DimWeight; Value=(2*Volume)/10000
Variable=BillableWeight; Value=max(DimWeight, Weight)

Name="0-3kg"; 0.1<BillableWeight<=3;Shipping=6.55
Name="B3-10kg"; 3.001<BillableWeight<10;Shipping=9.02
Name="B10-20kg"; 10.001<BillableWeight<20;Shipping=10.65
Name="B20-30kg"; 20.001<BillableWeight<30;Shipping=13.12
Name="B30-50kg"; 30.001<BillableWeight<50;Shipping=17.14
Name="B50-100kg"; 50.001<BillableWeight<100;Shipping=30.33

For example:

Consider three products:

P1: 27 cm x 21 cm x 10 cm. Weight: 6 Kg. Ordered: 3
P2: 46 cm x 24 cm x 49 cm. Weight: 8,60 Kg. Ordered: 2
P3: 8 cm x 5 cm x 3 cm. Weight: 0,20 Kg. Ordered: 1

The total weight is: 14,80 Kg.
Applying the formula the total volumetric weight is 25,06 Kg.

The price range must be: B20-30kg considering the volumetric weight, higher than the total weight in this case, but actually is B3-10kg and we don't know why?

Can you help us?

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Miscalculation of shipping volumes 24 Jan 2017 22:23 #2

Dear WindCommerce,
I don't see any obvious issues with your rules.
My first guess would be that some of the dimensions of the products are off in your product definitions (but I guess you have cross-checked that already).

What I would do to debug such issues is to add a debug message that shows the corresponding variables in a message, so I can check whether all variables really have the values I expect. In particular, I would add something like the following between your variable definitions and the actual rules:
Message="Volume={Volume}, Weight={Weight}, DimWeight={DimWeight}, BillableWeight={BillableWeight}"; Value=0
This will print the four relevant variables in a debug message.

If that does not lead you anywhere, you can print out the full list of all variables:
Message="<pre>All variables: {Debug_Values}</pre>"; Value=0

Best regards,

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