diff --git a/src/openapi/fiko/fiko-crud.yaml b/src/openapi/fiko/fiko-crud.yaml
index b51e1ad..27dbd5b 100644
--- a/src/openapi/fiko/fiko-crud.yaml
+++ b/src/openapi/fiko/fiko-crud.yaml
@@ -130,48 +130,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/unavailable"
-              example:
-                {
-                  "transactionItems":
-                    [
-                      {
-                        "transactionItemId": "afce35b2-1dff-4ace-98d0-4b9ac405c87d",
-                        "sourceName": "Verkoopengine",
-                        "transactionId": "1001236",
-                        "transactionLineId": "1",
-                        "name": "HTM Maandkorting 20%",
-                        "quantity": 1,
-                        "taxCode": "V21",
-                        "amountExclTax": 100,
-                        "amountInclTax": 121,
-                        "amountTax": 21,
-                        "occurredOn": "2024-10-04T00:00:00Z",
-                        "type": "debit",
-                        "productCode": "HTM-MND-20",
-                        "aggregationReference": "FIKO-123456",
-                        "accountingSystemReference": "U4F-123456",
-                      },
-                      {
-                        "transactionItemId": "e63cc37b-4d87-4278-8eb5-1477e07edf3d",
-                        "sourceName": "Verkoopengine",
-                        "transactionId": "1001237",
-                        "transactionLineId": "1",
-                        "name": "HTM Maandkorting 20%",
-                        "quantity": 1,
-                        "taxCode": "V21",
-                        "amountExclTax": 100,
-                        "amountInclTax": 121,
-                        "amountTax": 21,
-                        "occurredOn": "2024-10-04T00:05:00Z",
-                        "type": "debit",
-                        "productCode": "HTM-MND-20",
-                        "aggregationReference": "FIKO-123456",
-                        "accountingSystemReference": "U4F-123456",
-                      },
-                    ],
-                  "href": null,
-                }
+                $ref: "#/components/schemas/TransactionItemsGetResponseBody"
     post:
       summary: Add a finanicial transaction item.
       description: Add a finanicial transaction item.
@@ -182,33 +141,14 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/unavailable"
-            example:
-              {
-                "sourceName": "Verkoopengine",
-                "transactionId": "1001236",
-                "transactionLineId": "1",
-                "name": "HTM Maandkorting 20%",
-                "quantity": 1,
-                "taxCode": "V21",
-                "amountExclTax": 100,
-                "amountInclTax": 121,
-                "amountTax": 21,
-                "occurredOn": "2024-10-04T00:00:00Z",
-                "type": "debit",
-                "productCode": "HTM-MND-20",
-                "aggregationReference": null,
-                "accountingSystemReference": null,
-              }
+              $ref: "#/components/schemas/TransactionItemsPostRequestBody"
       responses:
         "201":
           description: Created
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/unavailable"
-              example:
-                { "transactionItemId": "afce35b2-1dff-4ace-98d0-4b9ac405c87d" }
+                $ref: "#/components/schemas/TransactionItemsPostResponseBody"
   /transactionitems/bulk:
     post:
       summary: Add one ore more finanicial transaction items in bulk.
@@ -220,58 +160,14 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/unavailable"
-            example:
-              [
-                {
-                  "sourceName": "Verkoopengine",
-                  "transactionId": "1001236",
-                  "transactionLineId": "1",
-                  "name": "HTM Maandkorting 20%",
-                  "quantity": 1,
-                  "taxCode": "V21",
-                  "amountExclTax": 100,
-                  "amountInclTax": 121,
-                  "amountTax": 21,
-                  "occurredOn": "2024-10-04T00:00:00Z",
-                  "type": "debit",
-                  "productCode": "HTM-MND-20",
-                  "aggregationReference": null,
-                  "accountingSystemReference": null,
-                },
-                {
-                  "sourceName": "Verkoopengine",
-                  "transactionId": "1001237",
-                  "transactionLineId": "1",
-                  "name": "HTM Maandkorting 20%",
-                  "quantity": 1,
-                  "taxCode": "V21",
-                  "amountExclTax": 100,
-                  "amountInclTax": 121,
-                  "amountTax": 21,
-                  "occurredOn": "2024-10-04T00:05:00Z",
-                  "type": "debit",
-                  "productCode": "HTM-MND-20",
-                  "aggregationReference": null,
-                  "accountingSystemReference": null,
-                },
-              ]
+              $ref: "#/components/schemas/TransactionItemsBulkPostRequestBody"
       responses:
         "201":
           description: Created
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/unavailable"
-              example:
-                [
-                  {
-                    "transactionItemId": "afce35b2-1dff-4ace-98d0-4b9ac405c87d",
-                  },
-                  {
-                    "transactionItemId": "e63cc37b-4d87-4278-8eb5-1477e07edf3d",
-                  },
-                ]
+                $ref: "#/components/schemas/TransactionItemsBulkPostResponseBody"
   /transactionitems/{transactionItemId}:
     parameters:
       - in: path
@@ -292,21 +188,14 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/unavailable"
-            example:
-              {
-                "aggregationReference": "FIKO-123456",
-                "accountingSystemReference": "U4F-123456",
-              }
+              $ref: "#/components/schemas/TransactionItemsPatchRequestBody"
       responses:
         "200":
           description: OK
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/unavailable"
-              example:
-                { "transactionItemId": "d667d293-aa82-4c9e-9b10-77cffc9058a1" }
+                $ref: "#/components/schemas/TransactionItemsPatchResponseBody"
   /transactionitems/{transactionItemId}/processingfailures:
     parameters:
       - in: path
@@ -2172,6 +2061,238 @@ components:
   schemas:
     unavailable:
       type: object
+    TransactionItemsGetResponseBody:
+      type: object
+      properties:
+        transactionItems: 
+          type: "array"
+          items:
+            type: object
+            properties:
+              transactionItemId: 
+                type: string
+                example: afce35b2-1dff-4ace-98d0-4b9ac405c87d
+              sourceName: 
+                type: string
+                example: Verkoopengine
+              transactionId: 
+                type: string
+                example: 1001236
+              transactionLineId: 
+                type: string
+                nullable: true
+                example: 1
+              name: 
+                type: string
+                example: HTM Maandkorting 20%
+              quantity: 
+                type: integer
+                example: 1
+              taxCode: 
+                type: string
+                example: V21
+              amountExclTax: 
+                type: number
+                example: 100
+              amountInclTax: 
+                type: number
+                example: 121
+              amountTax: 
+                type: number
+                example: 21
+              occurredOn: 
+                type: string
+                format: date-time
+                example: 2024-10-04T00:00:00Z
+              type: 
+                type: string
+                enum:
+                  - debit
+                  - credit
+                example: debit
+              productCode: 
+                type: string
+                example: HTM-MND-20
+              aggregationReference: 
+                type: string
+                nullable: true
+                example: FIKO-123456
+              accountingSystemReference: 
+                type: string
+                nullable: true
+                example: U4F-123456
+            required:
+              - transactionItemId
+              - sourceName
+              - transactionId
+              - name
+              - quantity
+              - taxCode
+              - amountExclTax
+              - amountInclTax
+              - amountTax
+              - occurredOn
+              - type
+              - productCode
+        href:
+          type: string
+          nullable: true
+          description: URI for pagination.
+          example: null
+    TransactionItemsPostRequestBody:
+      type: object
+      properties:
+        sourceName: 
+          type: string
+          example: Verkoopengine
+        transactionId: 
+          type: string
+          example: 1001236
+        transactionLineId: 
+          type: string
+          nullable: true
+          example: 1
+        name: 
+          type: string
+          example: HTM Maandkorting 20%
+        quantity: 
+          type: integer
+          example: 1
+        taxCode: 
+          type: string
+          example: V21
+        amountExclTax: 
+          type: integer
+          example: 100
+        amountInclTax: 
+          type: integer
+          example: 121
+        amountTax: 
+          type: integer
+          example: 21
+        occurredOn: 
+          type: string
+          format: date-time
+          example: 2024-10-04T00:00:00Z
+        type: 
+          type: string
+          enum:
+            - debit
+            - credit
+          example: debit
+        productCode: 
+          type: string
+          example: HTM-MND-20
+      required:
+        - sourceName
+        - transactionId
+        - name
+        - quantity
+        - taxCode
+        - amountExclTax
+        - amountInclTax
+        - amountTax
+        - occurredOn
+        - type
+        - productCode
+    TransactionItemsPostResponseBody:
+      type: object
+      properties:
+        transactionItemId:
+          type: string
+          example: afce35b2-1dff-4ace-98d0-4b9ac405c87d
+      required:
+        - transactionItemId
+    TransactionItemsBulkPostRequestBody:
+      type: object
+      properties:
+        transactionItems:
+          type: array
+          items:
+            type: object
+            properties:
+              sourceName: 
+                type: string
+                example: Verkoopengine
+              transactionId: 
+                type: string
+                example: 1001236
+              transactionLineId: 
+                type: string
+                nullable: true
+                example: 1
+              name: 
+                type: string
+                example: HTM Maandkorting 20%
+              quantity: 
+                type: integer
+                example: 1
+              taxCode: 
+                type: string
+                example: V21
+              amountExclTax: 
+                type: integer
+                example: 100
+              amountInclTax: 
+                type: integer
+                example: 121
+              amountTax:
+                type: integer
+                example: 21
+              occurredOn: 
+                type: string
+                format: date-time
+                example: 2024-10-04T00:00:00Z
+              type: 
+                type: string
+                enum:
+                  - debit
+                  - credit
+                example: debit
+              productCode: 
+                type: string
+                example: HTM-MND-20
+            required:
+              - sourceName
+              - transactionId
+              - name
+              - quantity
+              - taxCode
+              - amountExclTax
+              - amountInclTax
+              - amountTax
+              - occurredOn
+              - type
+              - productCode
+    TransactionItemsBulkPostResponseBody:
+      type: array
+      items:
+        type: object
+        properties:
+          transactionItemId:
+            type: string
+            example: afce35b2-1dff-4ace-98d0-4b9ac405c87d
+        required:
+          - transactionItemId
+    TransactionItemsPatchRequestBody:
+      type: object
+      properties:
+        aggregationReference:
+          type: string
+          nullable: true
+          example: FIKO-123456
+        accountingSystemReference:
+          type: string
+          nullable: true
+          example: U4F-123456
+    TransactionItemsPatchResponseBody:
+      type: object
+      properties:
+        transactionItemId:
+          type: string
+          example: afce35b2-1dff-4ace-98d0-4b9ac405c87d
+      required:
+        - transactionItemId
     rfc9457:
       type: object
       properties: