List widget over a reverse association ending on a generalization types its rows as the parent entity (CE1613)

[Chendodelangen]

List widget over a reverse association ending on a generalization types its rows as the parent entity (CE1613)

• mxcli version: v0.19.0 (2026-08-21T13:13:26Z)
• Mendix version: 11.12.2
• Severity: Medium — check/exec succeed; CE1613 surfaces later on every widget in the list template. New symptom of the closed umbrella Root cause: member/attribute enumerators don't walk the generalization chain (umbrella for #758, #703, #451) #765 (generalization chain), in the page writer's datasource row typing.
• Tracker searches: "listview association datasource" (Cross-module association datasource writes null DestinationEntityId, crashes Studio Pro (and mxbuild's own project loader) on open #854, ALTER SNIPPET/PAGE INSERT: pluggable-widget object-list children rejected; named-parameter-rooted list datasource passes check but fails build (CE7007) #911, DESCRIBE PAGE silently omits List View specialization templates; SHOW REFERENCES and SEARCH do not index their contents #940: different defects), "describe round-trip" → nothing on row typing over a generalization.

Steps to reproduce

CREATE PERSISTENT ENTITY MyModule.Base ("Title": String(200));
CREATE PERSISTENT ENTITY MyModule.Child EXTENDS MyModule.Base ("Own": String(20));
CREATE PERSISTENT ENTITY MyModule.Note ("Content": String(200));
CREATE ASSOCIATION MyModule.Note_Base FROM MyModule.Note TO MyModule.Base TYPE Reference OWNER Default;

create or modify page MyModule.Probe (
  Title: 'probe', Layout: Atlas_Core.PopupLayout, Folder: 'Pages',
  Params: { $Child: MyModule.Child }
) {
  dataview dv (DataSource: $Child) {
    listview lv (DataSource: $currentObject/MyModule.Note_Base) {
      container c {
        dynamictext t (Content: '{1}', RenderMode: Paragraph, ContentParams: [{1} = Content])
      }
    }
  }
}

Expected

Rows typed as MyModule.Note (the child/FROM side of the association), so Content resolves — that is what the same construction yields in Studio Pro.

Actual

[error] [CE1613] "The selected attribute 'MyModule.Base.Content' no longer exists." at Text 't'

The rows are typed as the association's TO side (Base). The identical construction works correctly when the association's TO side is the exact context entity (e.g. Line_Child with a $Child context): only the ends-on-a-generalization case mis-types.

Workaround

Feed such lists with a microflow datasource that retrieves the children.

• Diagnostic bundle: available, mxcli-diag-20260827-184627.tar.gz