[-] BO: Fix tax rule edition - unique tax rule can't be edited

controllers/admin/AdminTaxRulesGroupController.php

@@ -404,7 +404,7 @@ class AdminTaxRulesGroupControllerCore extends AdminController
 		{
 			foreach ($this->selected_states as $id_state)
 			{
-				if ($tax_rules_group->hasUniqueTaxRuleForCountry($id_country, $id_state))
+				if ($tax_rules_group->hasUniqueTaxRuleForCountry($id_country, $id_state, $id_rule))
 				{
 					$this->errors[] = Tools::displayError('A tax rule already exists for this country/state with tax only behavior');
 					continue;