diff --git a/src/main/java/it/gov/pagopa/afm/calculator/controller/CalculatorController.java b/src/main/java/it/gov/pagopa/afm/calculator/controller/CalculatorController.java
index d35127ab..71248483 100644
--- a/src/main/java/it/gov/pagopa/afm/calculator/controller/CalculatorController.java
+++ b/src/main/java/it/gov/pagopa/afm/calculator/controller/CalculatorController.java
@@ -195,7 +195,7 @@ public BundleOption getFees(
               content =
               @Content(
                   mediaType = MediaType.APPLICATION_JSON_VALUE,
-                  schema = @Schema(implementation = BundleOption.class))),
+                  schema = @Schema(implementation = it.gov.pagopa.afm.calculator.model.calculatormulti.BundleOption.class))),
           @ApiResponse(
               responseCode = "400",
               description = "Bad Request",
@@ -277,7 +277,7 @@ public it.gov.pagopa.afm.calculator.model.calculatormulti.BundleOption getFeesBy
               content =
               @Content(
                   mediaType = MediaType.APPLICATION_JSON_VALUE,
-                  schema = @Schema(implementation = BundleOption.class))),
+                  schema = @Schema(implementation = it.gov.pagopa.afm.calculator.model.calculatormulti.BundleOption.class))),
           @ApiResponse(
               responseCode = "400",
               description = "Bad Request",
diff --git a/src/main/java/it/gov/pagopa/afm/calculator/model/PaymentOptionMulti.java b/src/main/java/it/gov/pagopa/afm/calculator/model/PaymentOptionMulti.java
index e79dac16..f1615386 100644
--- a/src/main/java/it/gov/pagopa/afm/calculator/model/PaymentOptionMulti.java
+++ b/src/main/java/it/gov/pagopa/afm/calculator/model/PaymentOptionMulti.java
@@ -1,5 +1,6 @@
 package it.gov.pagopa.afm.calculator.model;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import lombok.*;
 import javax.validation.Valid;
 import javax.validation.constraints.NotEmpty;
@@ -18,6 +19,7 @@ public class PaymentOptionMulti {
   private List<PspSearchCriteria> idPspList;
   @Valid @NotNull @NotEmpty private List<PaymentNoticeItem> paymentNotice;
 
+  @JsonIgnore
   public Long getPaymentAmount () {
     return this.getPaymentNotice().stream().mapToLong(PaymentNoticeItem::getPaymentAmount).sum();
   }