creo4 Drawing Setup option documentation for: dual_metric_dim_show_fractions 
dual_metric_dim_show_fractions
Determines whether the metric portion of dual dimension will display fractions when the primary/model units are fractions.
Default and Available Settings:
no* - Dual dimensions do not display as fractions when the primary/model units
are fractions..
yes - Dual dimensions display as fractions when the primary/model units are
fractions.