Cost units can be edited

app/Domains/CostUnit/Actions/ChangeCostUnitDetails/ChangeCostUnitDetailsCommand.php

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+<?php
+
+namespace App\Domains\CostUnit\Actions\ChangeCostUnitDetails;
+
+class ChangeCostUnitDetailsCommand {
+    private ChangeCostUnitDetailsRequest $request;
+
+    public function __construct(ChangeCostUnitDetailsRequest $request) {
+        $this->request = $request;
+    }
+
+    public function execute(): ChangeCostUnitDetailsResponse {
+        $response = new ChangeCostUnitDetailsResponse();
+
+        $this->request->costUnit->distance_allowance = $this->request->distanceAllowance->getAmount();
+        $this->request->costUnit->mail_on_new = $this->request->mailOnNew;
+        $this->request->costUnit->billing_deadline = $this->request->billingDeadline;
+
+        $response->success = $this->request->costUnit->save();
+        return $response;
+    }
+}

app/Domains/CostUnit/Actions/ChangeCostUnitDetails/ChangeCostUnitDetailsRequest.php

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+<?php
+
+namespace App\Domains\CostUnit\Actions\ChangeCostUnitDetails;
+
+use App\Models\CostUnit;
+use App\ValueObjects\Amount;
+use DateTime;
+
+class ChangeCostUnitDetailsRequest {
+    public CostUnit $costUnit;
+
+    public Amount $distanceAllowance;
+    public bool $mailOnNew;
+    public ?DateTime $billingDeadline;
+
+    public function __construct(CostUnit $costUnit, Amount $distanceAllowance, bool $mailOnNew, ?DateTime $billingDeadline = null) {
+        $this->costUnit = $costUnit;
+        $this->distanceAllowance = $distanceAllowance;
+        $this->mailOnNew = $mailOnNew;
+        $this->billingDeadline = $billingDeadline;
+    }
+}

app/Domains/CostUnit/Actions/ChangeCostUnitDetails/ChangeCostUnitDetailsResponse.php

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+<?php
+
+namespace App\Domains\CostUnit\Actions\ChangeCostUnitDetails;
+
+class ChangeCostUnitDetailsResponse {
+    public bool $success;
+
+    public function __construct() {
+        $this->success = false;
+    }
+}