php - How to add a custom Fixed Product Tax / Weee to a quote item -


i'm using observer sales_quote_collect_totals_before try change tax of added product.
know can change tax settaxclassid product has multiple taxes need use fixed product tax (weee).
tried:

$items = $observer->getevent()->getquote()->getallvisibleitems(); foreach($items $item) {     $product = $item->getproduct();     $product->setpercent19(                 [                     [                         "website_id" => 0,                         "country" => "nl",                         "state" => "*", // optional                         "price" => 4.5                      ]                 ]             );      $product->setpercent6(                 [                     [                         "website_id" => 0,                         "country" => "nl",                         "state" => "*", // optional                         "price" => 1.2                      ]                 ]             );

but nothing happens.
tried adding $product->save(), changes product tax prices correct changing product not solution because there lot of customers using website.

any ideas how change hte fpt product in shopping cart?


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