---
id: object/page/157
type: object
title: Page 157 "Item Availability by Periods"
summary: Page 157 "Item Availability by Periods" in Base Application (Microsoft.Inventory.Availability). 2 public procedures. Present since at least BC23, still in BC30.
tier: official
language: en
tags:
  - page
  - base application
versions:
  introduced: null
  last_changed: null
  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: 6614cb50a79fee946e04fedc94c2296d9d2e35cb20f716b75e79de291fedfd5b
evidence:
  - kind: code
    url: https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Layers/W1/BaseApp/Inventory/Availability/ItemAvailabilitybyPeriods.Page.al
    title: src/Layers/W1/BaseApp/Inventory/Availability/ItemAvailabilitybyPeriods.Page.al (releases/29.x)
    date: null
    commit: ea08af5ef2d6a9b5c5af4a029288abbe2c883220
    t: null
    quote: null
  - kind: learn
    url: https://learn.microsoft.com/dynamics365/business-central/inventory-how-availability-overview
    title: Get an availability overview
    date: null
    commit: null
    t: null
    quote: null
links:
  learn:
    - https://learn.microsoft.com/dynamics365/business-central/inventory-how-availability-overview
  objects: []
  features: []
  topics:
    - topic/business-central/business-functionality/inventory
  localizations: []
  videos: []
  posts: []
  guidelines: []
object_type: page
object_id: 157
name: Item Availability by Periods
namespace: Microsoft.Inventory.Availability
app: Base Application
extends: null
first_version: "23"
last_version: "30"
present_in:
  - "23"
  - "24"
  - "25"
  - "26"
  - "27"
  - "28"
  - "29"
  - "30"
changed_in: []
source_major: "29"
obsolete: null
countries: []
ms_search_form_ids:
  - docs/learn-smb-docs/business-central/inventory-how-availability-overview.md
counts:
  fields: 0
  procedures: 19
  events: 0
  subscribers: 0
  controls: 3
  actions: 4
relations:
  out: 1
  referenced_by: 0
  pages: 0
  extended_by: 0
  event_subscribers: 0
  calls: 0
  called_by: 0
  implements: 0
---

# Page 157 "Item Availability by Periods"

> Page 157 "Item Availability by Periods" in Base Application (Microsoft.Inventory.Availability). 2 public procedures. Present since at least BC23, still in BC30.

Base Application · Microsoft.Inventory.Availability · BC23-30 · [source at ea08af5e](https://github.com/microsoft/BCApps/blob/ea08af5ef2d6a9b5c5af4a029288abbe2c883220/src/Layers/W1/BaseApp/Inventory/Availability/ItemAvailabilitybyPeriods.Page.al) · facts from BC29

## Properties

| Property | Value |
|---|---|
| Caption | Item Availability by Periods |
| SourceTable | Item |
| PageType | ListPlus |

## Fields on this page

Layout controls in source order, grouped by the container they sit in. Shows: the table field a control is bound to (or its expression as written); ToolTip: the control's own, else the bound field's (marked).

| Group | Control | Shows | ToolTip |
|---|---|---|---|
| Options | View by | `PeriodType` | Specifies by which period amounts are displayed. |
|  | View as | `AmountType` | Specifies how amounts are displayed. Net Change: The net change in the balance for the selected period. Balance at Date: The balance as of the last day in the selected period. |
| Content | ItemAvailLines | part [Page 353 "Item Availability Lines"](../page/353.md) | — |

## Actions

| Group | Action | ToolTip | Runs |
|---|---|---|---|
| Item Availability by | Event | View how the actual and the projected available balance of an item will develop over time according to supply and demand events. |  |
|  | Variant | View or edit the item's variants. Instead of setting up each color of an item as a separate item, you can set up the various colors as variants of the item. | [Page 5414 "Item Availability by Variant"](../page/5414.md) |
|  | Location | View the actual and projected quantity of the item per location. | [Page 492 "Item Availability by Location"](../page/492.md) |
|  | BOM Level | View availability figures for items on bills of materials that show how many units of a parent item you can make based on the availability of child items. |  |

## Procedures

- `UpdateSubForm()` (protected)
- `GetLastDate(): Date`

Plus 17 local procedures.

## Triggers

OnAfterGetRecord, OnQueryClosePage

## Relations

- source table [Table 27 "Item"](../table/27.md)

## Across versions

- Present in: BC23-30
- Changed (declaration) in: none

## Documented on Microsoft Learn

- [Get an availability overview](https://learn.microsoft.com/dynamics365/business-central/inventory-how-availability-overview)

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). 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: "page", object_name: "Item Availability by Periods")`, then `bcatlas_get_procedure_body` or `bcatlas_get_neighbors` on the returned id.