fix(taxes): correct compound tax document flows (#754)

app/Domains/Sales/Http/Requests/EstimatesRequest.php

@@ -9,9 +9,12 @@ use App\Platform\Pdf\Rules\PdfTemplateExists;
 use App\Support\DocumentTotals;
 use Illuminate\Foundation\Http\FormRequest;
 use Illuminate\Validation\Rule;
+use Illuminate\Validation\Validator;
 
 class EstimatesRequest extends FormRequest
 {
+    use Concerns\ValidatesDocumentTaxPlaceholders;
+
     /**
      * Determine if the user is authorized to make this request.
      */
@@ -115,6 +118,11 @@ class EstimatesRequest extends FormRequest
         return $rules;
     }
 
+    public function withValidator(Validator $validator): void
+    {
+        $this->validateDocumentTaxPlaceholders($validator);
+    }
+
     public function getEstimatePayload()
     {
         $company_currency = CompanySetting::getSetting('currency', $this->header('company'));