Embedding a custom component in Fiori Elements application

[robert_dokter]

Hello,

I’m trying to embed a custom attachment component into a Fiori elements application. I followed the steps in the documentation:

https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/4c3d1c6b3d744f84aab4c273f979f430/06fcc425fd7f47ec80a...

I know my custom attachment component is different from the standard attachment service, but the embedding into a Fiori elements app should be the same.

In the manifest of the embedding application, I set the InstanceID:

In de embedded attachments component function stStart does not receive the InstanceID, whereas the other settings/properties are set correctly:

What am I missing here?

Cheers,

Robert