To use a data region in a list, the list must have group expressions?

问题

Q:

I'm trying to control the visibility of the report sections.So I use a List.Each list will contain :

• A text box as a title for this section.

• A Table for the data.

If the Table has no rows ,I will hide the list.

After assigning the data source name to the list and to the table.

and trying to run. I get the following error.

The table ‘.....’ is in a list that has no group expressions defined for it. To use a data region in a list, the list must have group expressions.

How to fix this problem?

回答1:

You need to add a dummy grouping to the list.

Right click the list

Select properties

In the General tab click "Edit Details Group"

In the Group on expression write: =""

来源：https://stackoverflow.com/questions/7346383/to-use-a-data-region-in-a-list-the-list-must-have-group-expressions