On a piece of paper, look at each column formula and write down the field(s) referenced in the formulas.
查看每一个列公式，在一张纸上写下公式中引用的一个或多个字段。
Note that if your documents have multiple categories selected, you need to use additional code in the view column formula to ensure that all categories are displayed and can be looked up.
注意，如果文档选择了多个类别，那么需要在视图列公式中使用附加代码来确保所有类别都被显示，并且能够被查找。
One way to accomplish this is to set up your lookup view so that it has a second column with the formula shown in listing 9.
有一种方法可达到此目的：设置查找视图，使其包含具有清单 9 所示公式的另外一列。
应用推荐