cal. month text description

Hi,

Help required. We have a webi report which is directly connecting to BW report. BW report is sending only cal.month key eg: 01.

We created bar chart which will show cal in column & qty in row. in the output. the problem is that webi report is displaying only key" 1, 2, 3, 4, etc instead Jan, feb. any idea how to display descrition? where we have to change the settings in BOBJ