8.6.3 Substitution Character for the @ Character
Mandatory.
Specify the character that will be used as the substitution character for the @ character in LANSA. This will be used when validating object names.
The @ character is often used in LANSA internal file and library naming standards.
Note: Do not change this character unless you are absolutely sure that it needs to be changed as the result of character translation issues.
Also See