creo4 Drawing Setup option documentation for: EXCLUDE_AFFIXES_FROM_BASIC_BOX 
(Also MBD)
exclude_affixes_from_basic_box
Controls the default sate of the Exclude Prefix/Suffix from Basic box option under the Dimension
Text group on Dimension ribbon tab for the dimensions with tolerance mode set to basic.
no* - Disables the Exclude prefix/suffix from Basic
box option, to include the prefix and suffix values within the basic box of the dimension.
yes - Enables the Exclude prefix/suffix from Basic
box option, to exclude the prefix and suffix values within the basic box of the dimension.