diff --git a/src/models/actions/create/CreateDistanceDonation.ts b/src/models/actions/create/CreateDistanceDonation.ts
index 9df2cd8..ce01e86 100644
--- a/src/models/actions/create/CreateDistanceDonation.ts
+++ b/src/models/actions/create/CreateDistanceDonation.ts
@@ -1,4 +1,4 @@
-import { IsInt, IsPositive } from 'class-validator';
+import { IsInt, IsOptional, IsPositive } from 'class-validator';
 import { getConnection } from 'typeorm';
 import { RunnerNotFoundError } from '../../../errors/RunnerErrors';
 import { DistanceDonation } from '../../entities/DistanceDonation';
@@ -22,6 +22,7 @@ export class CreateDistanceDonation extends CreateDonation {
      * The donation's paid amount in the smalles unit of your currency (default: euro cent).
      */
     @IsInt()
+    @IsOptional()
     paidAmount?: number;
 
     /**
diff --git a/src/models/actions/create/CreateDonation.ts b/src/models/actions/create/CreateDonation.ts
index e54a1be..de93a97 100644
--- a/src/models/actions/create/CreateDonation.ts
+++ b/src/models/actions/create/CreateDonation.ts
@@ -1,4 +1,4 @@
-import { Exclude } from 'class-transformer';
+import { IsInt, IsOptional } from 'class-validator';
 import { getConnection } from 'typeorm';
 import { Donation } from '../../entities/Donation';
 import { Donor } from '../../entities/Donor';
@@ -7,10 +7,12 @@ import { Donor } from '../../entities/Donor';
  * This class is used to create a new Donation entity from a json body (post request).
  */
 export abstract class CreateDonation {
-    @Exclude()
+    @IsInt()
+    @IsOptional()
     donor: number;
 
-    @Exclude()
+    @IsInt()
+    @IsOptional()
     paidAmount?: number;
 
     /**