The SAP transaction SICF is used to maintain services for HTTP communication in the SAP System, using the Internet Communication Manager (ICM) and the Internet Communication Framework (ICF).
The easy way to remember this transaction is to use the memory aid "SICfrog"
When you first install your new SAP system, standard SAP services may not be active so you will have to use SICF to activate them, also when you create a new web service
you may have to activate it before it can be executed otherwise you may get an error saying
No roll storage space of length 9728 available for OCCURS area.
In order to activate a web service simple execute transaction SICF and enter the service name you want to activate.
Now press the execute button (green tick) and your web service should be displayed as follows
Next right click on the service name and choose 'Activate Service'
Please note: If you leave the service name blank on the initial screen of SICF you will simply get a tree structure
of your whole system, which you can expand to find the appropriate service