Certain characters that are valid for Windows user names are invalid in SAP ASE login user names.
Character mapping lets you determine how these invalid characters can be converted into characters that are valid for SAP ASE.
For example, the Windows user name “t-johns” contains a dash character (-), which is invalid in SAP ASE. You can map the dash character to a valid “at” sign (@) to make the user name compatible with SAP ASE, as “t@john”. The mapping stores the dash as an “at” sign, but displays it as a dash.
When you first install SAP ASE, the installation program maps a few invalid characters to the valid characters.