diff --git a/src/pyAEATsii/service.py b/src/pyAEATsii/service.py
index ed5ee00..cda31e2 100644
--- a/src/pyAEATsii/service.py
+++ b/src/pyAEATsii/service.py
@@ -71,12 +71,7 @@ class _IssuedInvoiceService(object):
         _logger.debug(response_)
         return response_
 
-    def cancel(self, headers, invoices, mapper=None):
-        body = (
-            [mapper.build_delete_request(i) for i in invoices]
-            if mapper
-            else invoices
-        )
+    def cancel(self, headers, body, mapper=None):
         _logger.debug(body)
         response_ = self.service.AnulacionLRFacturasEmitidas(
             headers, body)
@@ -110,12 +105,7 @@ class _RecievedInvoiceService(object):
         _logger.debug(response_)
         return response_
 
-    def cancel(self, headers, invoices, mapper=None):
-        body = (
-            [mapper.build_delete_request(i) for i in invoices]
-            if mapper
-            else invoices
-        )
+    def cancel(self, headers, body, mapper=None):
         _logger.debug(body)
         response_ = self.service.AnulacionLRFacturasRecibidas(
             headers, body)