FME 2025.0.2.0
I’ve built an embedded custom transformer which uses a web connection as a parameter.
When I initially use the custom transformer in my workspace I’m able to specify a deployment parameter for the value of the web connection.
e.g.

However, as soon as I close and re-open the transformer properties the connection becomes invalid and the OK button is disabled:

It’s not possible to re-assign the deployment parameter as the connection value unless I first clear it, then re-add it.
I’ve tried various workarounds (e.g. creating a standard published parameter to hold the deployment parameter value) but I can’t get this to behave like I think it should.
Has anyone been able to successfully use deployment parameters for web connection values in a custom transformer?
Also, not sure if it makes a difference but I’m using a custom web service for my web connection.