CAWN is a transparent table in SAP holding Characteristic Values for given Characteristic.
You can read more about the Characteristics and Classification Concept in this post: Classification Concept - Community Profiles - SCN Wiki
You can access this table from SE11 and check for/display the records via SE16.
If you are looking for Function Module, try using BAPI_CHARACT_GETDETAIL.
You can also check for function modules in the Package CT.
Maybe you want to go through this post : How to read classification