Issue in custom fields and logic app: Metadata not loaded

Hi All,

I am using custom fields and logic app to enhance the commercial project app.

I tired adding a simple text filed using the app. It works fine!

When I tried to add a field with code value , there seems to be an issue.

I have no problem in creating and publishing the field but,When I call the $metadata service of the application I don't see any xml coming up.The status seems to be OK ; 200;

Response body is empty. this happens only when I add a field with a value help

Please help