diff --git a/README.md b/README.md
index 312d521..0de9371 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ composer require robrichards/xmlseclibs
 ### 1. **Configuration**
 
 Before using any service, you must configure the library with your certificate, password, certificate type, and
-environment.  
+environment.
 Choose between certificate type (`certificate` or `seal`) and environment (`production` or `sandbox`) according to
 whether you'll be working in production or testing.
 
@@ -145,14 +145,17 @@ $invoice->operationDescription = 'Venta de productos';
 $invoice->taxAmount = 21.00; // Total tax amount
 $invoice->totalAmount = 121.00; // Total invoice amount
 $invoice->simplifiedInvoice = YesNoType::NO;
-$invoice->invoiceWithoutRecipient = YesNoType::NO; 
+$invoice->invoiceWithoutRecipient = YesNoType::NO;
+
+// If providing a subsanation after receiving an "Accepted with error" message
+// $invoice->isCorrection = true;
 
 // Add tax breakdown (using object-oriented approach)
 $breakdown = new Breakdown();
 $detail = new BreakdownDetail();
 $detail->taxType = TaxType::IVA;
 $detail->taxRate = 21.00;
-$detail->taxableBase = 100.00; 
+$detail->taxableBase = 100.00;
 $detail->taxAmount = 21.00;
 $detail->operationQualification = OperationQualificationType::SUBJECT_NO_EXEMPT_NO_REVERSE;
 $breakdown->addDetail($detail);
diff --git a/src/models/InvoiceSubmission.php b/src/models/InvoiceSubmission.php
index e5cf23f..757d7b3 100644
--- a/src/models/InvoiceSubmission.php
+++ b/src/models/InvoiceSubmission.php
@@ -53,6 +53,13 @@ class InvoiceSubmission extends InvoiceRecord
      */
     private $rectificationData = [];
 
+    /**
+     * Identifies if a submission is to subsanate a previous one accepted with errors
+     *
+     * @var YesNoType|null
+     */
+    public $isCorrection;
+
     /**
      * Invoice type (TipoFactura).
      * @var InvoiceType
@@ -442,6 +449,13 @@ public function rules(): array
 
                 return ($value instanceof YesNoType) ? true : 'Must be an instance of YesNoType.';
             }],
+            ['isCorrection', function ($value): bool|string {
+                if ($value === null) {
+                    return true;
+                }
+
+                return ($value instanceof YesNoType) ? true : 'Must be an instance of YesNoType.';
+            }],
             ['invoiceWithoutRecipient', function ($value): bool|string {
                 if ($value === null) {
                     return true;
@@ -557,7 +571,7 @@ public function rules(): array
 
     /**
      * Deprecated: Use InvoiceSerializer::toInvoiceXml() instead.
-     * 
+     *
      * @deprecated This method has been replaced by InvoiceSerializer::toInvoiceXml()
      * @return \DOMDocument
      * @throws \Exception
diff --git a/src/services/InvoiceSerializer.php b/src/services/InvoiceSerializer.php
index ef3f8a8..b116a56 100644
--- a/src/services/InvoiceSerializer.php
+++ b/src/services/InvoiceSerializer.php
@@ -7,6 +7,7 @@
 use eseperio\verifactu\models\Breakdown;
 use eseperio\verifactu\models\BreakdownDetail;
 use eseperio\verifactu\models\ComputerSystem;
+use eseperio\verifactu\models\enums\YesNoType;
 use eseperio\verifactu\models\InvoiceCancellation;
 use eseperio\verifactu\models\InvoiceId;
 use eseperio\verifactu\models\InvoiceQuery;
@@ -73,7 +74,10 @@ public static function toInvoiceXml(InvoiceSubmission $invoice, bool $validate =
         // NombreRazonEmisor (required)
         $root->appendChild($doc->createElementNS(self::SF_NAMESPACE, 'sf:NombreRazonEmisor', (string) $invoice->issuerName));
 
-
+		// Subsanacion (optional)
+		if($invoice->isCorrection) {
+			$root->appendChild($doc->createElementNS(self::SF_NAMESPACE, 'sf:Subsanacion', (string) $invoice->isCorrection->value));
+		}
 
         // TipoFactura (required)
         if ($invoice->invoiceType) {
diff --git a/tests/Unit/Models/InvoiceSubmissionTest.php b/tests/Unit/Models/InvoiceSubmissionTest.php
index 63e98c7..260aeba 100644
--- a/tests/Unit/Models/InvoiceSubmissionTest.php
+++ b/tests/Unit/Models/InvoiceSubmissionTest.php
@@ -78,6 +78,7 @@ public function testToXmlMethodExists(): void
         $submission->invoiceType = 'F1';
         $submission->taxAmount = 21.00;
         $submission->totalAmount = 121.00;
+        $submission->isCorrection = YesNoType::NO;
 
         // Set InvoiceId
         $invoiceId = new InvoiceId();
diff --git a/tests/Unit/Services/InvoiceSerializerTest.php b/tests/Unit/Services/InvoiceSerializerTest.php
index eeba837..fe5c286 100644
--- a/tests/Unit/Services/InvoiceSerializerTest.php
+++ b/tests/Unit/Services/InvoiceSerializerTest.php
@@ -56,6 +56,10 @@ public function testToInvoiceXml(): void
         $this->assertEquals(1, $nombreRazon->length);
         $this->assertEquals('Test Company', $nombreRazon->item(0)->textContent);
 
+        // Verify subsanation is not present
+        $correction = $dom->getElementsByTagNameNS(InvoiceSerializer::SF_NAMESPACE, 'Subsanacion');
+        $this->assertEquals(YesNoType::NO->value, $correction->item(0)->textContent);
+
         // Verify invoice type
         $tipoFactura = $dom->getElementsByTagNameNS(InvoiceSerializer::SF_NAMESPACE, 'TipoFactura');
         $this->assertEquals(1, $tipoFactura->length);
@@ -96,6 +100,23 @@ public function testToInvoiceXml(): void
         $this->assertEquals(str_repeat('a', 64), $huella->item(0)->textContent);
     }
 
+    /**
+     * Test that the InvoiceSerializer can generate a XML for InvoiceSubmission with the subsanation info
+     */
+    public function testToInvoiceXmlWithIsSubsanation()
+    {
+         // Create a basic InvoiceSubmission object
+        $invoice = $this->createBasicInvoiceSubmission();
+        $invoice->isCorrection = YesNoType::YES;
+
+        // Generate XML using the serializer
+        $dom = InvoiceSerializer::toInvoiceXml($invoice, false); // Skip validation
+
+        // Verify subsanation is present
+        $subsanation = $dom->getElementsByTagNameNS(InvoiceSerializer::SF_NAMESPACE, 'Subsanacion');
+        $this->assertEquals(YesNoType::YES->value, $subsanation->item(0)->textContent);
+    }
+
     /**
      * Test that the InvoiceSerializer can generate XML for an InvoiceCancellation.
      */
@@ -309,6 +330,7 @@ private function createBasicInvoiceSubmission(): InvoiceSubmission
         $invoice->operationDescription = 'Test operation';
         $invoice->taxAmount = 21.00;
         $invoice->totalAmount = 121.00;
+        $invoice->isCorrection = YesNoType::NO;
 
         // Add a recipient
         $recipient = new LegalPerson();
@@ -376,6 +398,9 @@ private function createBasicInvoiceQuery(): InvoiceQuery
         // Set counterparty
         $query->setCounterparty('87654321X', 'Test Counterparty');
 
+        // Set issuerparty
+        $query->setIssuerparty('98765432M', 'Test Issuer');
+
         // Set system info
         $query->setSystemInfo('Test System', '1.0');