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Chain of Command not working

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Posted on by ElAdeel7

Hello, this is the first time I am encountering this issue. On my devbox, I created a COC for a form data field.

Form: PurchReqTable

Datasource: PurchReqLine

Field: ItemId

I override the lookup and modified method on the FormDataField. However, it's not executing code inside my COC. I've tried debugging by placing breakpoints, but it does not hit the breakpoints. But it does execute the standard methods on the FormDataField.

Pic1: Standard method present on the formDataField

Pic2: This is my COC

Can anyone please help why this is happening?

For context:

I override the lookup method because I want to add 2 new columns on the ItemId lookup for the creation of Purchase Requisition Lines.
I override the modified method because, I want to set values to other fields based on the ItemId.

Categories:

Dynamics 365 Finance

Dynamics 365 Project Operations

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Sagar121 1,190 Super User 2026 Season 1 on at

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Hi,

Your code looks fine. You are confirming standard one hits so please try coc of form data field for other purchreqline fields where we don't have code already.

Based on that we can get more info. You can try event handlers at the end.

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André Arnaud de Cal... 304,293 Super User 2026 Season 1 on at

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Hi ElAdeel7,

Have you checked if your model got build correctly? Anyway, I suggest to not put your coding on the form level, but on the table. You can extend the PurchReqLine table method modifiedFieldItemId instead. This will ensure consistent code execution in case of different forms or import actions.

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Anton Venter 20,678 Super User 2026 Season 1 on at

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Hello,

I'm not sure why it's not working in your case but here is an example of overriding the lookup on a standard form (Sales order) using registerOverrideMethod. This might (probably will) work for you.

public class SalesTableEventHandler { [FormDataSourceEventHandler(formDataSourceStr(SalesTable, SalesLine), FormDataSourceEventType::Initialized)] public static void SalesLine_OnInitialized(FormDataSource _sender, FormDataSourceEventArgs _e) { var overrides = SalesTableFormExtensionOverrides::construct(); _sender.object(fieldNum(SalesLine, ItemId)).registerOverrideMethod(methodStr(FormDataObject, lookup), methodStr(SalesTableFormExtensionOverrides, ItemId_OnLookup), overrides); } } public class SalesTableFormExtensionOverrides { protected void new() { } public static SalesTableFormExtensionOverrides construct() { return new SalesTableFormExtensionOverrides(); } public void ItemId_OnLookup(FormStringControl _callingControl) { SysTableLookup sysTableLookup = SysTableLookup::newParameters(tableNum(InventTable), _callingControl); sysTableLookup.addLookupfield(fieldNum(InventTable, ItemId)); sysTableLookup.addLookupfield(fieldNum(InventTable, NameAlias)); sysTableLookup.performFormLookup(); } }

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Subramani Sivan 83 on at

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Hi

Could you please try the below options.

Close the VS studio and refresh the mode
Full custom model Build
Add few methods in the same class and check whether those methods has been triggered or not.

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venkateswarrao v 379 on at

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Hi ,

You cannot directly override the lookup method at FormDataField level through traditional CoC. The standard Microsoft methods intercept it first, so your CoC never gets a chance to execute.

The Two Valid Patterns:

Pattern 1: registerOverrideMethod (Anton's approach)

_sender.object(fieldNum(PurchReqLine, ItemId)).registerOverrideMethod( methodStr(FormDataObject, lookup), methodStr(YourClass, ItemId_CustomLookup), this);

Works, but requires wiring up during form initialization.

Pattern 2: Cancel the Super Call

[FormControlEventHandler(formControlStr(PurchReqTable, ItemId), FormControlEventType::Lookup)] public static void ItemId_OnLookup(FormControl sender, FormControlEventArgs e) { // Your custom lookup logic here var lookup = SysTableLookup::newParameters(tableNum(InventTable), sender); lookup.addLookupfield(fieldNum(InventTable, ItemId)); lookup.addLookupfield(fieldNum(InventTable, NameAlias)); // Custom column lookup.performFormLookup(); FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs; ce.CancelSuperCall(); }

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