diff --git a/src/org/openbravo/kikobar/intfactsunat/query-facturador.sql b/src/org/openbravo/kikobar/intfactsunat/query-facturador.sql
index c23ead7..9d75625 100644
--- a/src/org/openbravo/kikobar/intfactsunat/query-facturador.sql
+++ b/src/org/openbravo/kikobar/intfactsunat/query-facturador.sql
@@ -61,7 +61,7 @@ ad_client.name ='BLB'
 --/*
 select
 
-	jsonb_build_object(
+	(jsonb_build_object(
 		'cabecera', jsonb_agg(DISTINCT
 			jsonb_build_object(
 				'ivoiceid',c_invoice_id,
@@ -212,6 +212,7 @@ select
 				)
 			)->0
 		)
+	)::varchar
 
 --*/