---
id: object/codeunit/99000973
type: object
title: Codeunit 99000973 "Purch. Availability Mgt."
summary: Codeunit 99000973 "Purch. Availability Mgt." in Base Application (Microsoft.Purchases.Document). 4 public procedures, 6 events, 16 event subscribers. Introduced in BC25, still in BC30, changed in BC27-28.
tier: official
language: en
tags:
  - codeunit
  - base application
versions:
  introduced: "25"
  last_changed: "28"
  deprecated: null
review:
  state: derived
  by: null
  at: null
  flags: []
generated:
  at: "2026-10-11T00:31:51.816Z"
  pipeline: 0.2.0
  prompts: {}
  input_hash: 42983b3b7ac887a64b5a939122788a9b58504651952365af0b2acb4c7dd48261
evidence:
  - kind: code
    url: https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Layers/W1/BaseApp/Purchases/Document/PurchAvailabilityMgt.Codeunit.al
    title: src/Layers/W1/BaseApp/Purchases/Document/PurchAvailabilityMgt.Codeunit.al (releases/29.x)
    date: null
    commit: ea08af5ef2d6a9b5c5af4a029288abbe2c883220
    t: null
    quote: null
links:
  learn: []
  objects: []
  features: []
  topics: []
  localizations: []
  videos: []
  posts: []
  guidelines: []
  changes:
    - change/bcapps/9962
object_type: codeunit
object_id: 99000973
name: Purch. Availability Mgt.
namespace: Microsoft.Purchases.Document
app: Base Application
extends: null
first_version: "25"
last_version: "30"
present_in:
  - "25"
  - "26"
  - "27"
  - "28"
  - "29"
  - "30"
changed_in:
  - "27"
  - "28"
source_major: "29"
obsolete: null
countries: []
ms_search_form_ids: []
counts:
  fields: 0
  procedures: 32
  events: 6
  subscribers: 16
relations:
  out: 0
  referenced_by: 0
  pages: 0
  extended_by: 0
  event_subscribers: 0
  calls: 4
  called_by: 1
  implements: 0
---

# Codeunit 99000973 "Purch. Availability Mgt."

> Codeunit 99000973 "Purch. Availability Mgt." in Base Application (Microsoft.Purchases.Document). 4 public procedures, 6 events, 16 event subscribers. Introduced in BC25, still in BC30, changed in BC27-28.

Base Application · Microsoft.Purchases.Document · BC25-30 · [source at ea08af5e](https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Layers/W1/BaseApp/Purchases/Document/PurchAvailabilityMgt.Codeunit.al) · facts from BC29

## Events published

- `OnBeforeShowItemAvailFromPurchLine(var Item: Record Item; var PurchLine: Record "Purchase Line"; var IsHandled: Boolean; AvailabilityType: Enum "Item Availability Type")` (integration)
- `OnTransferPurchaseLineOnBeforeUnsupportedSourceError(var InventoryPageData: Record "Inventory Page Data"; InventoryEventBuffer: Record "Inventory Event Buffer"; var IsHandled: Boolean; SourceType: Integer; SourceSubtype: Integer; SourceID: Code[20]; PurchaseHeader: Record "Purchase Header")` (integration)
- `OnLookupEntriesOnAfterPurchLineSetFilters(var Item: Record Item; var PurchLine: Record "Purchase Line")` (integration)
- `OnAfterTransferFromPurchase(var InventoryEventBuffer: Record "Inventory Event Buffer"; PurchaseLine: Record "Purchase Line")` (integration)
- `OnAfterTransferFromPurchReturn(var InventoryEventBuffer: Record "Inventory Event Buffer"; PurchaseLine: Record "Purchase Line")` (integration)
- `OnBeforeUpdatePurchOrderAvail(var AvailabilityAtDate: Record "Availability at Date"; var Item: Record Item; var IsHandled: Boolean)` (integration)

## Event subscriptions

- OnSourceTypeTextOnFormat subscribes to Page "Demand Overview" OnSourceTypeTextOnFormat
- OnGetDemandDates subscribes to Codeunit "Calc. Availability Overview" OnGetDemandDates
- OnGetSupplyDates subscribes to Codeunit "Calc. Availability Overview" OnGetSupplyDates
- OnGetDemandEntries subscribes to Codeunit "Calc. Availability Overview" OnGetDemandEntries
- OnGetSupplyEntries subscribes to Codeunit "Calc. Availability Overview" OnGetSupplyEntries
- OnDemandExist subscribes to Codeunit "Calc. Availability Overview" OnDemandExist
- OnSupplyExist subscribes to Codeunit "Calc. Availability Overview" OnSupplyExist
- OnLookupAvailableInventory subscribes to Table "Availability Info. Buffer" OnLookupAvailableInventory
- OnLookupGrossRequirement subscribes to Table "Availability Info. Buffer" OnLookupGrossRequirement
- OnLookupPlannedOrderReceipt subscribes to Table "Availability Info. Buffer" OnLookupPlannedOrderReceipt
- OnLookupScheduledReceipt subscribes to Table "Availability Info. Buffer" OnLookupScheduledReceipt
- OnAfterCalcItemPlanningFields subscribes to Codeunit "Item Availability Forms Mgt" OnAfterCalcItemPlanningFields
- OnTransferToPeriodDetailsElseCase subscribes to Codeunit "Calc. Inventory Page Data" OnTransferToPeriodDetailsElseCase
- OnAfterMakeEntries subscribes to Page "Item Availability Line List" OnAfterMakeEntries
- OnAfterLookupEntries subscribes to Page "Item Availability Line List" OnAfterLookupEntries
- OnAfterCalculateAvailability subscribes to Codeunit "Available to Promise" OnAfterCalculateAvailability

## Procedures

- `ShowItemAvailabilityFromPurchLine(var PurchLine: Record "Purchase Line"; AvailabilityType: Enum "Item Availability Type")`
- `ShowPurchLines(var Item: Record Item)`
- `TransferFromPurchase(var InventoryEventBuffer: Record "Inventory Event Buffer"; PurchaseLine: Record "Purchase Line")`
- `TransferFromPurchReturn(var InventoryEventBuffer: Record "Inventory Event Buffer"; PurchaseLine: Record "Purchase Line")`

Plus 6 local procedures.

## Calls

From the extracted call graph of BC29 (graphify-al on the snapshot checkout): calls whose target is known from a declared type or an `Object::"Name"` argument. Interface dispatch and calls through events are not counted, so the list is not complete.

- [Codeunit 353 "Item Availability Forms Mgt"](../codeunit/353.md) (7 calls: `ShowItemAvailabilityFromPurchLine → FilterItem`, `ShowItemAvailabilityFromPurchLine → ShowItemAvailabilityByBOMLevel`, `ShowItemAvailabilityFromPurchLine → ShowItemAvailabilityByEvent`, …)
- [Codeunit 5830 "Calc. Availability Overview"](../codeunit/5830.md) (4 calls: `OnGetDemandDates → InsertAvailabilityEntry`, `OnGetDemandEntries → InsertAvailabilityEntry`, `OnGetSupplyDates → InsertAvailabilityEntry`, …)
- [Codeunit 5790 "Available to Promise"](../codeunit/5790.md) (2 calls: `UpdatePurchOrderAvail → UpdateGrossRequirement`, `UpdatePurchOrderAvail → UpdateScheduledReceipt`)
- [Codeunit 99000834 "Purch. Line-Reserve"](../codeunit/99000834.md) (2 calls: `TransferFromPurchase → ReservQuantity`, `TransferFromPurchReturn → ReservQuantity`)

## Called by

- [Codeunit 5530 "Calc. Item Availability"](../codeunit/5530.md) (2 calls: `TryGetPurchOrderSupplyEntries → TransferFromPurchase`, `TryGetPurchRetOrderDemandEntries → TransferFromPurchReturn`)

## Recent changes

- 2026-08-11 [#9962 [Extensibility Request] issue 30383: add purchase line transfer event](../../changes/bcapps/9962.md) (main, BC30, feature)

## Across versions

- Present in: BC25-30
- Changed (declaration) in: BC27-28

Source: AL metadata extracted from the code (names, ids, signatures, properties); no code bodies (D10).

## Ask your agent

Procedure bodies are not stored here (D10). The call sections above are our own, per object, from the BC29 call graph. For a procedure body or the calls of one procedure, ask bc-code-atlas (external, by Stefan Maron, MIT; default corpus w1-28), which the bc-observatory plugin connects: `bcatlas_resolve_node(object_type: "codeunit", object_name: "Purch. Availability Mgt.")`, then `bcatlas_get_procedure_body` or `bcatlas_get_neighbors` on the returned id.