Rich, thanks for your reply.

I found out that the method signature the REST lib builds depends on the MIME type defined on the "produces" and "consumes" swagger properties.

After adjusting the spec class with the correct values for those properties the methods signatures were built the same format of the others.

@Kamal Suri, thanks for your reply. The option is enabled, the problem occurs only if logged with the restricted user.

The output shows all namespaces either:

^%SYS("Ensemble","InstalledNamespace","ENSDEMO")=""
^%SYS("Ensemble","InstalledNamespace","ENSEMBLE")=""
^%SYS("Ensemble","InstalledNamespace","HSCUSTOM")=""
^%SYS("Ensemble","InstalledNamespace","HSDAUTOMATION")=""
^%SYS("Ensemble","InstalledNamespace","HSDINTEGRATION")=""
^%SYS("Ensemble","InstalledNamespace","HSDSERVICE")=""
^%SYS("Ensemble","InstalledNamespace","HSLIB")="/csp/hslib"
^%SYS("Ensemble","InstalledNamespace","HSSYS")=""