Hiding keyfigure description in graph

Hi DS experts,

I am experimenting with SAP BO Design Studio 1.1 on Netweaver / BW. I have a datasource with exact same source. In one graph the keyfigure name (Demo Amount) is hidden.

I don't understand why this is empty in below graph, I cannot find the setting for this in properties.

Does anyone have a clue?

Best regards,

F. Geldof