---
title: PurchaseOrderLine
summary: API reference for PurchaseOrderLine.
status: draft
owner: SAIF.Core documentation team
last_reviewed: 2026-09-24
library: SAIF.Data
reference_type: package
---

# PurchaseOrderLine

Domain entity representing Purchase order line data within the corporate area of the claims/policy domain, mapped for NHibernate persistence.*

## Purpose
- Models purchase order line data used by the corporate area of this library.*
- Inherits shared identity/lifecycle behavior from `EntityBase`.

## Context
- Namespace: `SAIF.Data.Model.Corporate`
- Assembly/package: `SAIF.Data`

## Public members
| Member | Signature | Purpose |
| --- | --- | --- |
| Id | `string Id { get; set; }` | Primary key / surrogate identifier for this record.* |
| PurchaseOrderNumber | `string PurchaseOrderNumber { get; set; }` | Value of purchase order number exposed by this type.* |
| Item | `string Item { get; set; }` | Value of item exposed by this type.* |
| ItemDescription | `string ItemDescription { get; set; }` | Value of item description exposed by this type.* |
| CommentIndex | `string CommentIndex { get; set; }` | Value of comment index exposed by this type.* |
| OriginalDescription | `string OriginalDescription { get; set; }` | Value of original description exposed by this type.* |
| Quantity | `double Quantity { get; set; }` | Value of quantity exposed by this type.* |
| LineNumber | `int LineNumber { get; set; }` | Value of line number exposed by this type.* |
| UnitCost | `decimal UnitCost { get; set; }` | Value of unit cost exposed by this type.* |
| UnitOfMeasure | `string UnitOfMeasure { get; set; }` | Value of unit of measure exposed by this type.* |
| TotalItemCost | `decimal TotalItemCost { get; set; }` | Value of total item cost exposed by this type.* |
| Comment | `string Comment { get; set; }` | Value of comment exposed by this type.* |
| OverflowComments | `IList<PurchaseOrderLineComment> OverflowComments { get; set; }` | Value of overflow comments exposed by this type.* |
| Equals | `bool Equals(object obj)` | Performs the `Equals` operation.* |
| GetHashCode | `int GetHashCode()` | Retrieves hash code.* |
| PurchaseOrderLine() | `PurchaseOrderLine()` | Initializes a new instance of the type with the supplied dependencies.* |

## Behavioral notes
- Properties are typically declared `virtual` to support NHibernate lazy-loading proxies (see the corresponding mapping file under `Data/SAIF.Data.NHibernate`).*

## Constraints and usage notes
- No additional usage constraints beyond standard NHibernate entity/DTO conventions could be confirmed from static analysis.**

> **Note:** Statements marked with * were inferred from code structure, naming conventions, or contextual evidence where direct confirmation was not available in source artifacts. Statements marked with ** could not be confirmed; treat as unknown until verified.

## Sources
- `Data/SAIF.Data/Model/Corporate/PurchaseOrderLine.cs`