Related entity items in an embedded custom page

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Posted on by MMCJF

I have created a custom page and embedded it in a model-driven app form (entity of model-driven app form: incident). In the custom page I have a gallery view showing items from a related entity (entity: objects). Hence the custom page is supposed to show objects related an incident.

The datasource for the gallery is 'objects'. However, the gallery is showing all of the objects and not only the ones related to the incident.

How do I filter the gallery in a Custom Page to only show related items?

Regards