How to add a Doc. Attachment List Factbox to a custom page in BC

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Posted on by AK-13051749-0

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Hello, can someone please guide me on how to add a Doc. Attachment List Factbox to a custom page using AL code?

This is how I tried adding it to my custom page:

When I try to upload a file, I am receiving the error below:

Any help would be greatly appreciated. Thank you!

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Dynamics 365 Business Central

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YUN ZHU 98,122 Super User 2026 Season 1 on at

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Hi, hope the following can give you some hints.

Dynamics 365 Business Central: How to add Attachments, Links, Notes Factbox to any pages

https://yzhums.com/11177/

Dynamics 365 Business Central: Displaying Sales Lines Attachments in a Factbox of Sales Order (42, Document) page

https://yzhums.com/54954/

Dynamics 365 Business Central: How to copy attachments from Warehouse Receipt to Posted Warehouse Receipt – Customization

https://yzhums.com/37986/

Thanks.

ZHU

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AK-13051749-0 268 on at

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Thank you for sharing the links.

Dynamics 365 Business Central: How to add Attachments, Links, Notes Factbox to any pages | Dynamics 365 Lab

Referring to the link above, since the Document Attachment Factbox is marked for removal and now replaced with Doc. Attachment List Factbox, I am receiving an error in the first event subscriber for 'OnBeforeDrillDown.' Could you please suggest how to resolve this?

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Pallavi Phade 5,292 Super User 2026 Season 1 on at

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Namaste @AK-13051749-0

Hope this Community Thread should help .

https://community.dynamics.com/forums/thread/details/?threadid=db5329a3-2f71-f011-bec2-7c1e52151eee

Warm Regards

Pallavi Phade

www.linkedin.com/in/pallaviphade131116

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OussamaSabbouh 11,106 Super User 2026 Season 1 on at

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Hello,

That error (“The record is not open.”) typically means the parent record hasn’t been saved yet or the FactBox isn’t linked to a real stored primary key. The Doc. Attachment FactBox requires a committed record so it can write the correct "Table ID" and "No." into Document Attachment. Make sure your page is not SourceTableTemporary = true, ensure the SubPageLink points to the actual primary key field stored on the table (for example field("No.") if that’s the PK), and confirm the record is saved before users upload files (users can navigate off the field to auto-save, or you can call CurrPage.SaveRecord() before opening attachments). If the PK is "ECO No.", link to that only if it is the real table key field. Once the record exists in the database and the link references the true key field, the upload will work.

Regards,
Oussama Sabbouh

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AK-13051749-0 268 on at

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@OussamaSabbouh

Thank you. My primary key is actually the No. field but the field type is Integer so I am receiving the error below.

I used the ECO No. field earlier in the SubPageLink property because the field type for that is Code and it contains the same value as the No. but converted from Integer to Code. Could you please suggest how I can resolve this error?

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AK-13051749-0 268 on at

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Thank you everyone for the suggestions and links to references!

I was able to use the ECO No. field in the SubPageLink property and added the Event Subscribers below. It is now working correctly!

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