In PeopleSoft Payables, business units are the highest level of a hierarchy of defaults, called the control hierarchy, which facilitates both voucher entry and payment processing. Default hierarchies are set up to reduce the amount of data entry required by the user. Hierarchical defaults set up at higher levels can be accepted or overridden by entering data.
The business unit level is the highest level at which a default can be set up. There may be other lower level defaults set up at supplier level or the item level. When there are defaults set up at higher and lower levels, the lower level defaults prevail as the default value. Further, any default value can be overridden during data entry by entering a valid value.