Understanding Line Numbers in Business Central

Understanding Line Numbers in Business Central

When working with documents in Microsoft Dynamics 365 Business Central—such as sales orders, purchase invoices, or journals—you may have noticed that each line has a Line No. like 10000, 20000, 30000, and so on.

But why are these numbers spaced so far apart?

Default Line Number Increment: 10,000

By default, Business Central increments line numbers by 10,000. This is not just a random choice—it’s designed to give you flexibility.

Example:

Line

Line No.

Description

1

10000

Item A

2

20000

Item B

3

30000

Item C

This wide spacing allows you to insert lines in between existing ones without having to renumber all subsequent lines.

For example:

If you need to insert a line between Item A and Item B, you can use line number 15000.

🧠 Why It Matters

  • Keeps data organized and sortable
  • Makes customizations and data imports easier
  • Supports scenarios where you need to reorder or insert lines frequently

⚙️ Can You Change It?

Yes—developers can adjust the increment logic in AL code (e.g., changing it to 1000 or another value), but 10000 remains the standard unless there’s a good reason to modify it.

Conclusion:
Business Central’s line number system is simple but powerful. The default 10000 increment gives users and developers the room they need to manage document lines with flexibility and control.

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