I’m working on a project using SAP CAP for the backend and Fiori Elements for the frontend. I’m facing a specific issue with the binding of a StepInput in an XML view. When I try to modify the value, it doesn’t seem to update properly in the model or reflect correctly in the StepInput after being processed.

My setup:

• Backend: SAP CAP (Node.js)
• Frontend: SAP Fiori with SAPUI5 (XML view)
• Model: OData V4 (generated by CAP)

The issue:

The StepInput displays the initial value correctly, and I can retrieve the modifications made in the UI. When I modify the value, I trigger an API call to perform a calculation using the modified value and other data. The API correctly returns the calculated result, but this updated value is not reflected in the StepInput.

What I’ve tried:

• Verified the binding in the XML view.
• Checked that the change event correctly triggers the calculation and updates the model.
• Ensured that the API returns the correct value and that it’s assigned back to the model.
• Verified that the OData service exposes the necessary metadata for the field.

GitHub repository:

I have created a public repository with a minimal example to reproduce the issue:

GitHub Repository

Thank for the help