initial

app/Models/TravelCostCode.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TravelCostCode extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelCostCodeFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'travel_request_id',
+        'business_unit',
+        'project_grant',
+        'account_code',
+        'class_code',
+    ];
+
+    public function travelRequest(): BelongsTo
+    {
+        return $this->belongsTo(TravelRequest::class);
+    }
+}