When building dimensions, you must set field types for fields that contain member names or member information, such as member properties or attribute associations.
To set field type information:
Select Field, and then Properties.
In the Field Properties dialog box, select the Dimension Build Properties tab.
Double-click the dimension name.
If the Dimension node is empty, click the Outline button to associate the rules file with an outline.
Double-click the field type.
Click Next to set field information for the next field in the rules file.
Click OK.
“List of Field Types and Valid Build Methods” in the Oracle Essbase Database Administrator's Guide