improved invoice handling for fixed rates (#1058)

src/Invoice/Renderer/AbstractSpreadsheetRenderer.php

@@ -10,7 +10,7 @@
 namespace App\Invoice\Renderer;
 
 use App\Entity\InvoiceDocument;
-use App\Model\InvoiceModel;
+use App\Invoice\InvoiceModel;
 use PhpOffice\PhpSpreadsheet\IOFactory;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;