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Child grid calculated field not refreshing when parent changes (D365FO)

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Posted on by Statics 365

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Question

I have a form in Dynamics 365 Finance & Operations with a parent–child data source structure.

Parent: JobLine
Child: Layer

In the child grid, there is a calculated field (for example, Ampere) that is calculated from:

Fields in the parent table (Quantity, Area)
And data from another table (MasterTable.Multiple)

The calculation is correct at the database level, but the issue is UI refresh timing.

Observed behavior:

When Quantity or Area is changed in the parent record
The calculated value in the child grid does not update immediately
The value only updates after clicking around the form, changing focus, or reselecting the record

Question:

What is the correct, framework-compliant approach in D365FO to make a calculated/displayed field in a child data source update immediately (in real time) when values in the parent data source change?

Any guidance or best-practice approach would be appreciated.

Categories:

Microsoft Dynamics AX

Dynamics 365 Finance

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André Arnaud de Cal... 301,452 Super User 2025 Season 2 on at

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Hi Statics 365,

There are several commands for refreshing/rereading the data source or form. You can call such method at e.g. the write event of the parent data source.

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Sagar121 899 on at

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Hi,

If you have created display method then you need to put JobLine_ds.observe(). Your child DS don't know then parent DS is changed.

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Statics 365 196 on at

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Thank you for your reply.

Let me clarify my scenario again:

- The Ampere field is already implemented as a display method.
- The display method is on the child table (Layer).
- The calculation depends on fields from the parent data source (JobLine).

I understand that the child data source needs to be notified when the parent changes.
However, I’m still not sure how this should be implemented correctly according to the framework.

Could you please provide a working code example showing:
- where observe() should be called
- and how the parent and child data sources should be wired together
so that the display method refreshes immediately when the parent record changes?

Thank you in advance.

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Martin Dráb 238,127 Most Valuable Professional on at

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You need to call the observe() method of JobLine data source in your display method. Check out Display methods and Form Observability for more details.

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Sagar121 899 on at

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Hi,

Assume you have created display method at form DataSource level so you can call JobLine_ds.observe() inside your display method.

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