You can set an expression to be the default value of an attribute for an element.
To use an expression as the default value of an attribute
1 Click the Settings icon , and then, from the Configure group, click Attributes.
2 Select a module.
3 Select an existing attribute by clicking its link, or add an attribute by clicking Add Attribute.
4 In the Default value field, type:
=
The Evaluate Expression, Help, List Business Rules options are displayed.
5 To evaluate the expression before you save it, click Evaluate Expression.
6 Click OK.
Note The attribute value of all new elements will be an expression. You can edit the expressions in the attributes lists of the element. You can also enter a new expression, and enter a “normal” attribute value.