List of values not showing all values while using BICS connection

Hello All,

In WebI report development, I am using BEx query as a data source. The BEx query has one mandatory variable of calendar Yr-Month. The data is available for year 2007 to 2013 in BW. The list of values of this prompt sometimes displays only values from 07.2007 to 12.2009. Some times it shows all values i.e. from 07.2007 to 01.2013. I do not know why the list of values is varying. Has anyone experienced such kind of behavior?

Thanks and Regards,

Aashutosh