diff --git a/src/openapi/contracts/contracts-crud.yaml b/src/openapi/contracts/contracts-crud.yaml
index 963bf1e..6733363 100644
--- a/src/openapi/contracts/contracts-crud.yaml
+++ b/src/openapi/contracts/contracts-crud.yaml
@@ -213,6 +213,19 @@ paths:
                               "updated": "2024-06-02 15:01:00.000",
                               "state": "invoice_created",
                               "isCredit": false,
+                              "invoiceAccountingStatuses":
+                                [
+                                  {
+                                    "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
+                                    "accountingStatus":
+                                      {
+                                        "accountingStatusId": 1,
+                                        "name": "open",
+                                      },
+                                    "createdOn": "2024-06-02 15:01:00.000",
+                                    "description": null,
+                                  },
+                                ],
                             },
                             {
                               "contractInvoiceId": "1c345237-4d84-47f0-93c2-7b94338e3355",
@@ -222,6 +235,19 @@ paths:
                               "updated": "2024-07-02 15:01:00.000",
                               "state": "invoice_created",
                               "isCredit": false,
+                              "invoiceAccountingStatuses":
+                                [
+                                  {
+                                    "invoiceAccountingStatusId": "1e95b854-0094-42a4-9268-c16353fb72a8",
+                                    "accountingStatus":
+                                      {
+                                        "accountingStatusId": 1,
+                                        "name": "open",
+                                      },
+                                    "createdOn": "2024-07-02 15:01:00.000",
+                                    "description": null,
+                                  },
+                                ],
                             },
                           ],
                         "contractVersions":
@@ -271,6 +297,19 @@ paths:
                               "updated": "2024-06-02 15:01:00.000",
                               "state": "invoice_created",
                               "isCredit": false,
+                              "invoiceAccountingStatuses":
+                                [
+                                  {
+                                    "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
+                                    "accountingStatus":
+                                      {
+                                        "accountingStatusId": 1,
+                                        "name": "open",
+                                      },
+                                    "createdOn": "2024-06-02 15:01:00.000",
+                                    "description": null,
+                                  },
+                                ],
                             },
                             {
                               "contractInvoiceId": "1c345237-4d84-47f0-93c2-7b94338e3355",
@@ -280,6 +319,19 @@ paths:
                               "updated": "2024-07-02 15:01:00.000",
                               "state": "invoice_created",
                               "isCredit": false,
+                              "invoiceAccountingStatuses":
+                                [
+                                  {
+                                    "invoiceAccountingStatusId": "1e95b854-0094-42a4-9268-c16353fb72a8",
+                                    "accountingStatus":
+                                      {
+                                        "accountingStatusId": 1,
+                                        "name": "open",
+                                      },
+                                    "createdOn": "2024-07-02 15:01:00.000",
+                                    "description": null,
+                                  },
+                                ],
                             },
                           ],
                         "contractVersions":
@@ -400,6 +452,16 @@ paths:
                             "state": "invoice_created",
                             "data": "{json}",
                             "isCredit": false,
+                            "invoiceAccountingStatuses":
+                              [
+                                {
+                                  "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
+                                  "accountingStatus":
+                                    { "accountingStatusId": 1, "name": "open" },
+                                  "createdOn": "2024-06-02 15:01:00.000",
+                                  "description": null,
+                                },
+                              ],
                           },
                         ],
                     },
@@ -459,7 +521,7 @@ paths:
         content:
           application/json:
             schema:
-              $ref: "#/components/schemas/ContractVersion"
+              $ref: "#/components/schemas/InvoiceAccountingStatus"
             example:
               {
                 "contractVersion":
@@ -567,6 +629,16 @@ paths:
                         "state": "invoice_sent",
                         "data": "{json}",
                         "isCredit": false,
+                        "invoiceAccountingStatuses":
+                          [
+                            {
+                              "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
+                              "accountingStatus":
+                                { "accountingStatusId": 1, "name": "open" },
+                              "createdOn": "2024-06-02 15:01:00.000",
+                              "description": null,
+                            },
+                          ],
                       },
                       {
                         "contractInvoiceId": "dadff658-4ff5-4eb8-b516-492f1f6c6245",
@@ -577,6 +649,16 @@ paths:
                         "state": "invoice_created",
                         "data": "{json}",
                         "isCredit": false,
+                        "invoiceAccountingStatuses":
+                          [
+                            {
+                              "invoiceAccountingStatusId": "84af0f01-0416-4860-851a-a0d4b3cf674a",
+                              "accountingStatus":
+                                { "accountingStatusId": 1, "name": "open" },
+                              "createdOn": "2024-06-02 15:01:00.000",
+                              "description": null,
+                            },
+                          ],
                       },
                     ],
                 }
@@ -601,6 +683,15 @@ paths:
                     "state": "invoice_created",
                     "data": "{json}",
                     "isCredit": false,
+                    "invoiceAccountingStatuses":
+                      [
+                        {
+                          "invoiceAccountingStatusId": 1,
+                          "createdOn",
+                          "2024-07-02 15:01:00.000",
+                          "description": null,
+                        },
+                      ],
                   },
               }
       responses:
@@ -721,6 +812,16 @@ paths:
                         "state": "invoice_created",
                         "data": "{json}",
                         "isCredit": false,
+                        "invoiceAccountingStatuses":
+                          [
+                            {
+                              "invoiceAccountingStatusId": "32785417-1fb8-42c7-bda1-533f5868809f",
+                              "accountingStatus":
+                                { "accountingStatusId": 1, "name": "open" },
+                              "createdOn": "2024-06-02 15:01:00.000",
+                              "description": null,
+                            },
+                          ],
                       },
                       {
                         "contractId": "a7452e22-3894-40cc-87d6-869370a92277",
@@ -732,6 +833,16 @@ paths:
                         "state": "invoice_created",
                         "data": "{json}",
                         "isCredit": false,
+                        "invoiceAccountingStatuses":
+                          [
+                            {
+                              "invoiceAccountingStatusId": "84af0f01-0416-4860-851a-a0d4b3cf674a",
+                              "accountingStatus":
+                                { "accountingStatusId": 1, "name": "open" },
+                              "createdOn": "2024-08-02 15:01:00.000",
+                              "description": null,
+                            },
+                          ],
                       },
                     ],
                 }
@@ -778,6 +889,43 @@ paths:
                       "contractInvoiceId": "8699d72a-cf4d-4e6b-9e9c-549d837ca51f",
                     },
                 }
+  /contractinvoices/{contractInvoiceId}/invoiceaccountingstatuses:
+    parameters:
+      - in: path
+        name: contractInvoiceId
+        schema:
+          type: string
+          format: uuid
+          example: d1dd439b-6072-4b97-89c9-724268865b93
+        required: true
+        description: The id of the ContractInvoice, formatted as UUID.
+    post:
+      summary: Add a new invoice accounting status to a contract invoice.
+      description: Add a new invoice accounting status to a contract invoice.
+      tags:
+        - ContractInvoice
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: "#/components/schemas/ContractInvoice"
+            example:
+              {
+                "accountingStatusId": 1,
+                "createdOn": "2024-07-02 15:01:00.000",
+                "description": null,
+              }
+      responses:
+        "201":
+          description: Created
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ContractInvoice"
+              example:
+                {
+                  "invoiceAccountingStatusId": "a6836364-4812-4960-9226-69deb2e2b903",
+                }
   /contracts/{contractId}/contractactions:
     parameters:
       - in: path
@@ -1068,6 +1216,37 @@ components:
         isCredit:
           type: boolean
           example: false
+    InvoiceAccountingStatus:
+      type: object
+      properties:
+        invoiceAccountingStatusId:
+          type: string
+          format: uuid
+          example: 6b6f0f5e-5d3f-4a6d-8e7d-6a7d0f9e6c5b
+        contractInvoiceId:
+          type: string
+          format: uuid
+          example: 8699d72a-cf4d-4e6b-9e9c-549d837ca51f
+        accountingStatus:
+          type: object
+          $ref: "#/components/schemas/AccountingStatus"
+        createdOn:
+          type: string
+          format: date-time
+          example: 2024-07-02 15:01:00.000
+        description:
+          type: string
+          example: Open
+    AccountingStatus:
+      type: object
+      properties:
+        accountingStatusId:
+          type: integer
+          example: 1
+        name:
+          type: string
+          enum: [open, sent, received, rejected]
+          example: open
     ContractStatus:
       type: object
       properties:
@@ -1076,7 +1255,16 @@ components:
           example: 2
         name:
           type: string
-          enum: [new, active, suspended, cancelled, terminated, pending cancellation, pending termination]
+          enum:
+            [
+              new,
+              active,
+              suspended,
+              cancelled,
+              terminated,
+              pending cancellation,
+              pending termination,
+            ]
           example: active
     ActionType:
       type: object