[rules-users] default value in condition column configuration in Guvnor

Hi, I am using Guvnor 5.2.0.CR1 when I select default value option for a condition column in condition column configuration popup window in Guided Decision Table editor and enter a default value , it shows up for every cell under that column when I create rows for that decision table.This is expected behaviour If I delete the value in some of the cells , save it , the decision Table screen shows the value as deleted, but when I click on View source, it still shows the value for all the rows. Is this expected behaviour ? I would expect that if the decision table shows no value for a cell, then clicking on View source should show no value for that row as well. Only when I uncheck the default value in the condition columns configuration screen, it shows the cell as empty for those with no value. Can someone let me know if this is a bug? Thanks, Ram