I wanted the printted ouput from my proc MIXED to trim down a little, I have MANY levels of USUBJID. I added the NOCLPRINT option and got a big fat warning in the log. I got the expected output but I don't need to be warned.
proc mixed data=analysis NOCLPRINT=10;
class parent trt02pn avisitn usubjid;
model Y = parent|trt02pn|avisitn / ddfm=kenwardroger;
repeated avisitn / type=un subject=usubjid;
WARNING: Class levels for USUBJID are not printed because of excessive size.