service/porttypes is a SAP Parameter attribute which is used to control Enabled webservice ports information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Web service port types that are activated in the start service. Specify
the port types to be activated separated by spaces.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.