如何grey（搜索）Crystal报表以获取列的所有用途？

I am trying to remove all references to a table from a Crystal XI report. Crystal is telling me that a column from that table is currently being used, because there is a little green check mark over the field in the field viewer. Also, if I try to remove the entire table, I get a warning. The warning is almost useless though because it doesn't tell me I am trying to remove all references to a table