I ran this code:  DATA marker_map;  input id $2. VALUE $7. MARKERSYMBOL $5. MARKERCOLOR $6.;  VALUE = strip(value);  DATALINES;   ms Male   X     blue  ms Female plus  green ;  run;    PROC SGPANEL data= death_1 dattrmap=marker_map;   panelby Age_group; SCATTER Y = COVID_19_Deaths X = Total_Deaths / group =Sex attrid=ms;  RUN;   And for some reason it runs the proc sgpanel BUT it doesn't want to read attrid=ms. It keeps returning with the warning: Invalid attrid "MS" specified. The attrid will be ignored.    What am I doing wrong?    ... View more