Outputting data using an NI breakout box

[schrodinger50]

For some reason in LabVIEW 7, when trying to setup a VI to output data
through an analogue channel, the channel selection only lets me select
input channels. Has anybody any idea why this is? Or more importantly
how to get round this simple but annoying problem. (Note my VIs work
in LabVIEW 6).