Labelling categories and making referent variables

[u41125093]

I'm getting an error message when trying to make a referent variable, not sure if it's to do with how i've labelled the categories or an issues with the ref statement. Any help would be appreciated, thanks team. 

PROC FORMAT;
VALUE BMIgfmt
1="Underweight/Normal"
2="Overweight"
3="Obese";
RUN;

PROC GLM DATA=bpdata2 PLOTS=diagnostics;
CLASS bmig (REF= 'Underweight/Normal');
MODEL DBP= age smokgp BMIg / SOLUTION CLPARM TOLERANCE;
RUN;

ERROR: Invalid reference value for BMIg.

[andreas_lds]

I am not familiar with proc glm, but i would expect that i had to use the unformatted value. And, by the way, where do you assign the format to bmig?

[data_null__]

You don't appear to have associated the format with the variable.

format BMIG BMIgfmt.;

Also shouldn't SMOKGP also be in CLASS statement.