напомните плз 
Function func Return value
charlen - Length of the first character of arg in the code page used: 1 for non-Unicode single-byte code; 1 or 2 for non-Unicode double-byte code; 1 for Unicode with single Unicode characters; 2 for Unicode with double unicode characters;
dbmaxlen - Maximum length of a string defined in the ABAP Dictionary (RAWSTRING, SSTRING, STRING). If the string is unlimited, the constant abap_max_db_string_ln or abap_max_db_rawstring_ln is returned from the type group ABAP.
numofchar - Same as for the function strlen, except that in this case when a non-Unicode double-byte code is used, a character that occupies 2 bytes is only counted once.
strlen - Number of characters in arg; blanks at the end of data objects with a fixed length are not counted, although they are counted in type string data objects. If you use a non-Unicode double-byte code, a character that occupies 2 bytes is counted twice.
xstrlen - Number of bytes in arg.
Ну тебя интересует strlen писать типа так len = strlen( <строка> ). Пробелы после скобок обязательны
