Short Dump While Changing Non-KeyField of Sorted Table

Question

Hello,
A short dump occurs while trying to change a field of a sorted table item passed as CHANGING parameter.  Are non-key fields in a sorted structure protected? The error message does not explicitely say so. Can anyone link to documentation explaining this behavior? 
best regards,
JNN

Answer 1

You are passing by reference with CHANGING.
It looks like read-only stuff can't be passed to method CHANGING.
When I pass a literal or constant, there is a syntax error.
System could have given you a syntax error instead of dump.
Have a look at this snippet. Both method calls throw syntax error.
CLASS mainclass DEFINITION.
  PUBLIC SECTION.
    CLASS-METHODS main.
  PRIVATE SECTION.
    CLASS-METHODS passref CHANGING cv_test TYPE i.
ENDCLASS.                    "mainclass DEFINITION
CLASS mainclass IMPLEMENTATION.
  METHOD main.
    "pass literal by ref
    passref(
      CHANGING
        cv_test = '2'
    "pass constant by ref
    CONSTANTS lc_test TYPE i VALUE 1.
    passref(
      CHANGING
        cv_test = lc_test
  ENDMETHOD.                    "main
  METHOD passref.
    "nothing
  ENDMETHOD.                    "passref
ENDCLASS.                    "mainclass IMPLEMENTATION
START-OF-SELECTION.
  mainclass=>main( ).