> ## Documentation Index
> Fetch the complete documentation index at: https://docs.arcuserp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Revalue a fixed asset (IFRS IAS 16 mark-to-market write-up)

> Write-up only. Increases the asset's cost_basis to a new net book
value, posting DR Fixed Asset / CR Revaluation Surplus (equity).
Falls back to retained_earnings when no revaluation_surplus account
is seeded. The `new_book_value` MUST exceed the current net book
value; for write-downs use POST /impair instead. Two elections:

* `ifrs` (default): standard IAS 16 revaluation model. Credit goes
  to revaluation_surplus (equity OCI).
* `us_gaap`: rarely permitted under ASC 360. Use only when your
  accounting policy explicitly allows US GAAP write-ups; otherwise
  the impairment-recovery model in POST /recover_impairment is the
  conventional path.

Rule 21 enforces GL postability + balance inside postJournalEntry.
Rule 23: this is the ONLY function besides createFixedAsset that
writes `fixed_assets.cost_basis`. Idempotent when `Idempotency-Key`
is supplied.




## OpenAPI

````yaml /openapi.yaml post /fixed_assets/{id}/revalue
openapi: 3.1.0
info:
  title: Arcus ERP Public API
  version: 1.0.0
  description: >
    Arcus ERP public REST API. Designed for external integrations and data
    migration.


    **Authentication.** Bearer token (API key) via the `Authorization` header.

    Format: `Authorization: Bearer ark_live_ent_<code>_<random>` (or
    `ark_test_*` for sandbox).

    API keys are issued per-entity in **Settings > Developers > API Keys**.


    **Entity scoping.** The entity is encoded in the API key prefix; routes are
    flat

    (e.g. `/v1/accounts`, `/v1/orders`, `/v1/products`). A small set of platform
    endpoints

    (migration, reconciliation, events, webhook endpoints, API keys) use the

    `/v1/entities/{entity_id}/...` form -- those are noted in their tags.


    **Key capabilities.**
      - Related-resource hydration via `?expand[]=` (see `x-arcus-expand` on each resource).
      - Cursor-based pagination (`starting_after` / `ending_before` / `limit`).
      - Idempotency via the `Idempotency-Key` header.
      - Webhook events for asynchronous notification.
      - Conditional requests / ETag for cache validation.
servers:
  - url: https://api.arcuserp.com/v1
    description: Arcus ERP API (accepts both live `ark_live_*` and test `ark_test_*` keys)
  - url: https://dev-api.arcuserp.com/v1
    description: >-
      Dev sandbox API (test-only data, accepts `ark_test_*` keys against dev
      RDS)
security: []
paths:
  /fixed_assets/{id}/revalue:
    parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
          format: uuid
    post:
      tags:
        - Fixed Assets
      summary: Revalue a fixed asset (IFRS IAS 16 mark-to-market write-up)
      description: |
        Write-up only. Increases the asset's cost_basis to a new net book
        value, posting DR Fixed Asset / CR Revaluation Surplus (equity).
        Falls back to retained_earnings when no revaluation_surplus account
        is seeded. The `new_book_value` MUST exceed the current net book
        value; for write-downs use POST /impair instead. Two elections:

        * `ifrs` (default): standard IAS 16 revaluation model. Credit goes
          to revaluation_surplus (equity OCI).
        * `us_gaap`: rarely permitted under ASC 360. Use only when your
          accounting policy explicitly allows US GAAP write-ups; otherwise
          the impairment-recovery model in POST /recover_impairment is the
          conventional path.

        Rule 21 enforces GL postability + balance inside postJournalEntry.
        Rule 23: this is the ONLY function besides createFixedAsset that
        writes `fixed_assets.cost_basis`. Idempotent when `Idempotency-Key`
        is supplied.
      operationId: revalueAsset
      parameters:
        - $ref: '#/components/parameters/IdempotencyKey'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - new_book_value
                - reason
              properties:
                new_book_value:
                  type: number
                  format: float
                  minimum: 0.01
                  example: 62000
                fair_value:
                  type: number
                  format: float
                  description: >-
                    Optional market fair value at the revaluation date
                    (informational; stored on the history row).
                valuation_method:
                  type: string
                  enum:
                    - market
                    - appraisal
                    - indexation
                    - other
                  default: market
                reason:
                  type: string
                  example: Independent appraisal Q2 2026 (Crowe
                  file APR-2026-0418).: null
                effective_date:
                  type: string
                  format: date
                  description: Defaults to today when omitted.
                election:
                  type: string
                  enum:
                    - ifrs
                    - us_gaap
                  default: ifrs
      responses:
        '200':
          description: Asset revalued
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      asset:
                        $ref: '#/components/schemas/FixedAsset'
                      history_id:
                        type: string
                        format: uuid
                      journal_entry_id:
                        type: string
                        format: uuid
                      delta:
                        type: number
                        format: float
        '400':
          description: >-
            REVALUE_NOT_WRITE_UP (new_book_value <= current NBV),
            ASSET_DISPOSED, bad election, missing reason
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          $ref: '#/components/responses/Error'
        '422':
          description: >-
            GL_ACCOUNTS_NOT_SEEDED (no revaluation_surplus or retained_earnings
            account on this entity)
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - ApiKeyAuth:
            - assets:write
components:
  parameters:
    IdempotencyKey:
      name: Idempotency-Key
      in: header
      required: false
      description: |
        Client-generated unique key for idempotent POST/PATCH/DELETE operations.
        Alias for the Idempotency parameter. Max 255 chars. On retry with the
        same key, the original response is returned without re-executing the
        operation. Keys expire after 24 hours.
      schema:
        type: string
        maxLength: 255
  schemas:
    FixedAsset:
      type: object
      description: >
        A capitalized fixed asset (PP and E) tracked on the entity's books with
        cost basis, accumulated depreciation, depreciation schedule, and
        lifecycle state. Lifecycle: `pending_service` (created, not yet placed
        in service), `active` (depreciating), `suspended` (depreciation halted),
        `fully_depreciated` (accumulated depreciation equals depreciable base),
        `disposed` (sold/scrapped/donated/traded_in). Scope: assets:read /
        assets:write. Rule 23 SSOT: `cost_basis` is written only by
        createFixedAsset and revalueAsset; `accumulated_depreciation` is written
        only by postDepreciation, disposeAsset, impairAsset, and revalueAsset.
      properties:
        id:
          type: string
          format: uuid
          readOnly: true
        entity_id:
          type: string
          format: uuid
          readOnly: true
        asset_code:
          type: string
          description: >-
            Stable per-entity code (auto-generated via canonical getNextNumber
            when omitted).
        name:
          type: string
        description:
          type: string
          nullable: true
        serial_number:
          type: string
          nullable: true
        status:
          type: string
          enum:
            - pending_service
            - active
            - suspended
            - fully_depreciated
            - disposed
        category_id:
          type: string
          format: uuid
          nullable: true
        location_id:
          type: string
          format: uuid
          nullable: true
        vendor_id:
          type: string
          format: uuid
          nullable: true
        po_id:
          type: string
          format: uuid
          nullable: true
        vendor_bill_id:
          type: string
          format: uuid
          nullable: true
        cost_basis:
          type: number
          format: float
        salvage_value:
          type: number
          format: float
        accumulated_depreciation:
          type: number
          format: float
          readOnly: true
        tax_accumulated_depreciation:
          type: number
          format: float
          readOnly: true
        net_book_value:
          type: number
          format: float
          readOnly: true
          description: cost_basis minus accumulated_depreciation.
        depreciation_method:
          type: string
          enum:
            - straight_line
            - declining_balance
            - double_declining
            - sum_of_years
            - units_of_production
            - macrs
            - bonus_macrs
            - section_179
        useful_life_months:
          type: integer
        macrs_class:
          type: string
          nullable: true
          enum:
            - three_year
            - five_year
            - seven_year
            - ten_year
            - fifteen_year
            - twenty_year
            - twenty_seven_five_year
            - thirty_nine_year
        macrs_convention:
          type: string
          nullable: true
          enum:
            - half_year
            - mid_quarter
            - mid_month
        placed_in_service_date:
          type: string
          format: date
          nullable: true
        acquisition_date:
          type: string
          format: date
          nullable: true
        disposal_date:
          type: string
          format: date
          nullable: true
          readOnly: true
        disposal_method:
          type: string
          nullable: true
          enum:
            - sold
            - scrapped
            - donated
            - traded_in
          readOnly: true
        disposal_amount:
          type: number
          format: float
          nullable: true
          readOnly: true
        gain_loss_amount:
          type: number
          format: float
          nullable: true
          readOnly: true
        gl_asset_account_id:
          type: string
          format: uuid
        gl_accum_depr_account_id:
          type: string
          format: uuid
        gl_depr_expense_account_id:
          type: string
          format: uuid
        warranty_expiration:
          type: string
          format: date
          nullable: true
        warranty_provider:
          type: string
          nullable: true
        warranty_terms:
          type: string
          nullable: true
        insurance_policy:
          type: string
          nullable: true
        insurance_expiration:
          type: string
          format: date
          nullable: true
        notes:
          type: string
          nullable: true
        metadata:
          type: object
          nullable: true
        created_at:
          type: string
          format: date-time
          readOnly: true
        updated_at:
          type: string
          format: date-time
          readOnly: true
    Error:
      description: |
        Alias for ErrorEnvelope. Canonical error response shape used by all
        API endpoints. Refer to ErrorEnvelope for the full field definition.
      allOf:
        - $ref: '#/components/schemas/ErrorEnvelope'
    ErrorEnvelope:
      type: object
      description: |
        Canonical error response envelope. All API errors use this shape.
      required:
        - error
        - code
      properties:
        error:
          type: string
          description: Machine-readable error key
          example: not_found
        code:
          type: string
          description: Machine-readable error code (often same as error)
          example: not_found
        type:
          type: string
          enum:
            - validation_error
            - permission_error
            - not_found
            - conflict
            - rate_limit
            - internal
            - expand_error
            - not_implemented
          example: not_found
        hint:
          type: string
          description: Human-readable one-sentence explanation (English)
          example: >-
            The requested order does not exist or does not belong to this
            entity.
        param:
          type: string
          description: The parameter that caused the error, if applicable
          example: expand[0]
        required:
          type: string
          description: The scope required (only on insufficient_scope errors)
          example: accounts:read
        request_id:
          type: string
          description: >-
            Unique request ID for support tracing (maps to CloudWatch log
            stream)
          example: req_abc123
  responses:
    Error:
      description: Error response (400/401/403/404/409/422/429/500)
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorEnvelope'
  securitySchemes:
    ApiKeyAuth:
      type: http
      scheme: bearer
      description: |
        API key issued per entity via Settings > Developers > API Keys.
        Each key carries scopes (e.g. orders:read, products:write).
        Bearer token format: Authorization: Bearer ark_live_ent_<code>_<random>
        Test keys use ark_test_ent_<code>_<random>. Both are issued per entity
        via Settings > Developers > API Keys.

````