Thanks for your inquiry. I suggest you please use the latest version of Aspose.Words for Reporting Services 4.3.0.
If the problem still remains, please use the select statement (to populate the data) inside
your RDL file and share that RDL file with us. I will investigate the
issue on my side and provide you more information.
Please see the following DataSet example with select statement for your kind reference:
<CommandText>select 1 as value, ‘label1’ as label
select 2 as value, ‘label2’ as label
select 3 as value, ‘label3’ as label
select 4 as value, ‘label4’ as label