Have a look in the Teamcenter Connector Sample Application Mendix Marketplace - Teamcenter Connector Sample Application
The SaveEdit microflow updates properties on a workspace object using the "Update Properties" activity
In the "Toolbox sample" module
https://marketplace.mendix.com/link/component/202292
You will find a microflow called "UpdateProperties" to do it in 1 call, it's more convenient to use because the properties to be updated are described with a simple string with separator ";".
In this example, you write back to teamcenter the attribute "object_name" and "object_desc".
Don't forget: If you want to generate microflows for this, you can also use the Teamcenter Extension: https://marketplace.mendix.com/link/component/225544. We included the update object use case.