See this SAS NOTE about restricting model parameters. You cannot use the RESTRICT statement in PROC REG to specify an upper bound, but other procedures allow it. For example, to ensure that the intercept term is not negative, you can use
proc fmm data=sashelp.class;
model weight = height;
restrict int 1 >= 0;
run;
For your problem, use
restrict int 1 <= 1;
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