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Set Required Mandatory Fields in Transactions in Business Central

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Posted on by DinB

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What is the best way to configure certain fields as mandatory in transaction pages such as Sales Order, Sales Invoice, and Purchase Order? The fields must have a value in order to Post. The Posting Preview should also display appropriate error messages.

For example: I want to make “Contact” mandatory. There are also other customized fields from multiple extensions that need to be set as mandatory.

Is there already an App or built‑in feature that can achieve this without having to do additional AL coding? If AL coding is necessary, can you give basic steps and methods?
Thank you.

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Dynamics 365 Business Central

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OussamaSabbouh 6,754 on at

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Hello

There is no built-in feature or Microsoft app in Business Central to make arbitrary fields mandatory at posting time (including Posting Preview). Page-level tricks don’t work reliably. The only correct and supported way is AL: subscribe to posting events (Sales-Post / Purch.-Post), validate required standard or custom fields (even from other extensions), and raise an Error if a value is missing. This automatically blocks Post and Posting Preview and works for all entry points. Best practice is to centralize the checks in one validation codeunit, optionally driven by a setup table to avoid hardcoding.

Regards,

Oussama Sabbouh

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YUN ZHU 95,937 Super User 2025 Season 2 on at

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Hi, Unfortunately, as of now, customization is the only option.

Hope the following helps

Dynamics 365 Business Central: How to make a field mandatory

https://yzhums.com/4940/

Dynamics 365 Business Central: The red asterisk next to a field (mandatory field???)

https://yzhums.com/58640/

Thanks.

ZHU

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