I would get the Program(), lineno() and probably try and get the call stack as well. This is will provide you with pretty much all the information you need.

Typically this is what I return.

"Error " + ALLTRIM(STR(ERROR())) + CHR(13)+ ;
"Message() " + ALLTRIM(MESSAGE()) + CHR(13) + ;
"Message(1) " + ALLTRIM(MESSAGE(1)) + CHR(13) + ;
"SYS(2018) " + ALLTRIM(SYS(2018)) + CHR(13) + ;
"Program " + ALLTRIM(UPPER(p_PROGRAM)) + CHR(13) + ;
"Line Number " + ALLTRIM(STR(p_LINENO)) + CHR(13)

And get the callstack by this;

FUNCTION callstack
PARAMETERS p_prog
PRIVATE w_prog, w_return, w_sub, w_cnt

w_return = ""

FOR w_sub = 2 TO 32
IF program(w_sub)==p_prog
EXIT
ENDIF
NEXT

FOR w_cnt = w_sub TO 2 STEP -1
IF w_return==""
w_return=PROGRAM(w_cnt)
ELSE
w_return = w_return + "," + PROGRAM(w_cnt)
ENDIF
NEXT

RETURN w_return

Hope this helps.

Jon