Regarding the problem that special characters are not allowed in variable names of unicode ABAP programs

Look at the following program:

DATA: lv_囧          TYPE char1.

By default, variable names in ABAP programs do not allow special characters, such as 囧.

The error message mentions that in Unicode programs, the character "囧" cannot appear in names, such as in the name "LV_囧". This error message is generated by the ABAP programming language engine and tells you that an disallowed character appears in the name of an identifier in your ABAP program. Let me explain this error message in detail and the possible causes.

1. Character sets and Unicode:

   In a Unicode programming environment, text can be represented using a worldwide set of characters. Unicode is a character encoding standard that allows all characters, including various languages, symbols and special characters, to be correctly represented. ABAP is a Unicode-aware programming language, which means it is able to handle a wide range of characters.

2. Identifier naming rules:

   In ABAP, identifiers are names used to name various program elements such as variables, functions, classes, tables, etc. ABAP has some naming rules, one of which is that identifiers cannot contain specific characters. The "囧" character mentioned in the error message is a character that is not allowed in identifiers.

3. Explain the error message:

   The "LV_囧" in the error message is an example identifier name that violates ABAP's identifier naming rules. In this case, the "囧" character is not allowed in identifier names.

4. Example:

   Here is an example of why the identifier name "LV_囧" raises an error:

   DATA: LV_囧 TYPE STRING.
   

   In this example, we tried to declare a string variable named "LV_囧", but this is not allowed because the "囧" character violates the rules for ABAP identifiers.

5. Solution:

   To fix this, you need to change the identifier name to ensure it only contains allowed characters. Identifier names should usually start with a letter and may only contain letters, numbers, and underscores. Here's an example fix:

   DATA: LV_ValidName TYPE STRING.
   

   In this example, we change the identifier name to "LV_ValidName", which is a legal identifier name and does not contain disallowed characters.

6. Other considerations:

   In addition to character sets and identifier naming rules, you also need to ensure that your ABAP program is running in a Unicode environment. If your system is not a Unicode system, configuration changes may be required to support Unicode character sets.

In summary, the problem mentioned in the error message is due to the use of the disallowed character "囧" as an identifier name in the ABAP program. To solve this problem, you need to change the identifier name to comply with ABAP's identifier naming rules and ensure that your ABAP environment supports the Unicode character set. With these measures, you will be able to eliminate this error and activate your ABAP program smoothly. The error message mentions that in Unicode programs, the character "囧" cannot appear in names, such as in the name "LV_囧". This error message is generated by the ABAP programming language engine and tells you that an disallowed character appears in the name of an identifier in your ABAP program. Let me explain this error message in detail and the possible causes.

1. Character sets and Unicode:

   In a Unicode programming environment, text can be represented using a worldwide set of characters. Unicode is a character encoding standard that allows all characters, including various languages, symbols and special characters, to be correctly represented. ABAP is a Unicode-aware programming language, which means it is able to handle a wide range of characters.

2. Identifier naming rules:

   In ABAP, identifiers are names used to name various program elements such as variables, functions, classes, tables, etc. ABAP has some naming rules, one of which is that identifiers cannot contain specific characters. The "囧" character mentioned in the error message is a character that is not allowed in identifiers.

3. Explain the error message:

   The "LV_囧" in the error message is an example identifier name that violates ABAP's identifier naming rules. In this case, the "囧" character is not allowed in identifier names.

4. Example:

   Here is an example of why the identifier name "LV_囧" raises an error:

   DATA: LV_囧 TYPE STRING.
   

   In this example, we tried to declare a string variable named "LV_囧", but this is not allowed because the "囧" character violates the rules for ABAP identifiers.

5. Solution:

   To fix this, you need to change the identifier name to ensure it only contains allowed characters. Identifier names should usually start with a letter and may only contain letters, numbers, and underscores. Here's an example fix:

   DATA: LV_ValidName TYPE STRING.
   

   In this example, we change the identifier name to "LV_ValidName", which is a legal identifier name and does not contain disallowed characters.

6. Other considerations:

   In addition to character sets and identifier naming rules, you also need to ensure that your ABAP program is running in a Unicode environment. If your system is not a Unicode system, configuration changes may be required to support Unicode character sets.

In summary, the problem mentioned in the error message is due to the use of the disallowed character "囧" as an identifier name in the ABAP program. To solve this problem, you need to change the identifier name to comply with ABAP's identifier naming rules and ensure that your ABAP environment supports the Unicode character set. With these measures, you will be able to eliminate this error and activate your ABAP program smoothly.