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Programmatically assign Invoice Number while Posting from Sales Order

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Posted on by DinB

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When we post Sales Invoice from Sales Order in BC, the Invoice number is assigned based on No. Series. Is it possible to programmatically assign manual Invoice Number? For example, when user Post Invoice, the Invoice Number would be based on Customer PO Number in Sales Order with a Prefix, such as "INV-<Customer PO>"

Thank you.

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Dynamics 365 Business Central

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Ramesh Kumar 7,511 Super User 2025 Season 2 on at

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Programmatically assign Invoice Number while Posting from Sales Order

I don't think its possible in standard Business Central but would be done using custom code. But why do you need to Customer PO in invoice. You can create custom flow field to track the customer POs

Thanks!

Ramesh

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Gerardo Rentería Ga... 23,574 Most Valuable Professional on at

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Programmatically assign Invoice Number while Posting from Sales Order

Hi

Similar question

Solved: No.Series selection for Posted Invoices in Business central

Best

GR

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YUN ZHU 92,727 Super User 2025 Season 2 on at

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Programmatically assign Invoice Number while Posting from Sales Order

This needs to be customized, or you need to enter it manually each time. Hopefully the following information can give you some hints

Dynamics 365 Business Central: Manual number for Posted Sales invoice and Posted Purchase invoice (Use the same number in Sales Order and Posted Sales Invoice?)

https://yzhums.com/21537/

Thanks.

ZHU

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Mansi Soni 8,876 Super User 2025 Season 2 on at

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Programmatically assign Invoice Number while Posting from Sales Order

Hello,

Yes, it is possible to assign a custom invoice number like "INV-" when posting a Sales Invoice from a Sales Order in Business Central, but it requires customization. By default, the system uses the No. Series for invoice numbering, and overriding this behavior programmatically involves customizing the posting routine to fetch the Customer PO number and assign it as the invoice number with a prefix. This must be done carefully to ensure uniqueness and maintain data integrity.

Hope this answer will help you!

Regards,
Mansi Soni

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Sohail Ahmed 11,087 Super User 2025 Season 2 on at

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Programmatically assign Invoice Number while Posting from Sales Order

@DinB

In standard Business Central, the invoice number is strictly controlled by the No. Series defined in the Sales & Receivables Setup and assigned on the Sales Header. Business Central does not support manual invoice numbering during posting due to audit trail and data integrity constraints.

However, to achieve what you're asking — assigning the invoice number programmatically based on the Customer PO No. — you'd need to:

1. Create a customization in AL.

2. Use the OnBeforeInsertSalesInvoiceHeader event in the Codeunit 80 "Sales-Post" to override the No. field before the invoice is created.

3. Validate that the number you assign does not conflict with existing entries and aligns with any required number series settings.

Keep in mind:

You might face restrictions when trying to bypass the No. Series enforcement.

Doing this can break future posting and integration logic (like e-invoicing or audit expectations).

A safer alternative is to keep the standard number, but include the Customer PO No. prominently in the external document number or description field on the invoice.

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RockwithNav 8,344 Super User 2025 Season 2 on at

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Programmatically assign Invoice Number while Posting from Sales Order

There's a column which says Posting No on the Order, enable this and put it on the order screen, whatever value you will feed in this that will be used as Posted Invoice No.

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