BEx: Drop Down box shows compound values

Hello !

I am trying to use the drop down box feature in order to filter cost centers (0costcenter). The infoobject 0costcenter has two compunding infoobjects: 0soursystem and 0co_area. When I display key and text in the drop down box, it shows "sourcesystem/co area/cost center[text]" instead of just "cost center[text]". However in the related query/ data provider, the cost centers are displayed without compounding infoobjects.

Is anyone familiar with this problem and has a solution to this ?

Thanks in advance,

Max