About displaying and validating data – PB Docs 2017

When PowerBuilder generates a basic DataWindow object, it uses the
extended attributes defined for the data and stored in the extended
attribute system tables.

For more information about the extended attribute system tables,
see Appendix A, The Extended Attribute System
Tables.

In the Database painter, you can create the extended attribute
definitions that specify a column’s display format, edit style, and
validation rules.

In the DataWindow painter, you can override these extended
attribute definitions for a column in a DataWindow object. These
overrides do not change the information stored with the column
definition in the extended attribute system tables.