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id: post/thatnavguy-com/https-thatnavguy-com-blog-2026-bc-friday-tips-74-copy-document--70de705561
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title: "BC Friday Tips #74 Copy Document and Custom Field"
summary: When adding custom fields to Sales Header or Sales Invoice Header tables, developers must consider how the Copy Document feature will handle those fields. The post explains that custom fields are automatically copied along with documents, requiring developers to decide whether values should be copied, cleared, or recalculated to maintain data integrity.
tier: community
language: en
tags:
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  - custom fields
  - sales header
  - data integrity
  - al development
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    title: "BC Friday Tips #74 Copy Document and Custom Field"
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    title: "BC Friday Tips #74 Copy Document and Custom Field"
    date: "2026-06-26"
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    t: null
    quote: If users use Copy Document, your custom field will be copied too.
  - kind: blog
    url: https://thatnavguy.com/blog/2026/bc-friday-tips-74-copy-document/
    title: "BC Friday Tips #74 Copy Document and Custom Field"
    date: "2026-06-26"
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    quote: A small design decision now can prevent a lot of problems later.
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post_id: https://thatnavguy.com/blog/2026/bc-friday-tips-74-copy-document/
source_id: thatnavguy-com
source_name: That NAV Guy
url: https://thatnavguy.com/blog/2026/bc-friday-tips-74-copy-document/
published_at: "2026-06-26T00:00:00.000Z"
author: Teddy Herryanto
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words: 122
quotes:
  - text: If users use Copy Document, your custom field will be copied too.
    why_it_matters: This explains that custom fields are not exempt from Copy Document behavior, making developers responsible for controlling this behavior
  - text: A small design decision now can prevent a lot of problems later.
    why_it_matters: This emphasizes the importance of planning Copy Document behavior upfront rather than fixing it reactively
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  - table Sales Invoice Header
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  - development
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# BC Friday Tips #74 Copy Document and Custom Field

[Read the post](https://thatnavguy.com/blog/2026/bc-friday-tips-74-copy-document/) · That NAV Guy (Teddy Herryanto, MVP) · 2026-06-26 · 122 words · tier community · reviewed (checked by Opus)

> When adding custom fields to Sales Header or Sales Invoice Header tables, developers must consider how the Copy Document feature will handle those fields. The post explains that custom fields are automatically copied along with documents, requiring developers to decide whether values should be copied, cleared, or recalculated to maintain data integrity.

## Key points

- Custom fields added to Sales tables are automatically included when users copy documents
- Developers must determine for each field whether its value should be copied, cleared, or recalculated
- Improper Copy Document behavior can introduce invalid data and cause process issues
- Field design decisions at creation time prevent problems during document operations

## Quotes

- "If users use Copy Document, your custom field will be copied too." (This explains that custom fields are not exempt from Copy Document behavior, making developers responsible for controlling this behavior)
- "A small design decision now can prevent a lot of problems later." (This emphasizes the importance of planning Copy Document behavior upfront rather than fixing it reactively)

## AL objects mentioned

As named in the post. A name that matches one object page by exact type and name links to it; the others stay as named.

- [table 36 "Sales Header"](../../objects/table/36.md)
- [table 112 "Sales Invoice Header"](../../objects/table/112.md)

## Context

- Features: Copy Document, Custom Fields

Source: That NAV Guy, community blog. Summary, key points and quotes are derived (CONTENT-NOTICE.md); read the original for the full text.