ABAP Keyword Documentation → ABAP Overview → ABAP and Unicode → Differences between Unicode and Non-Unicode Programs
Comments and Literals in Non-Unicode Programs
In non-Unicode systems, no characters should be used in comments unless they are available in all code pages supported by SAP. In the worst case, a program can no longer be executed when a code page other than the one in which it was created is used. We recommend the usage of 7-Bit-ASCII-characters only.
Other versions:
7.31 | 7.40 | 7.54
Note
In a Unicode system, all source codes are stored in Unicode and this is why this problem does not occur there. However, even in Unicode programs, do not use characters for comments and literals if they cannot be displayed in non-Unicode programs, so that programs can be transported from a Unicode system to a non-Unicode system without losses during conversion.