Hi Tom,
If by 'trailing income statements' you mean displaying the most recent 12 columns, then there are a different set of codes available. In the View / Account Data field listing, these fields are labelled as 'Rolling Period Net Changes' and you can use either 'NET_[x]M' or simply '_[x]M, which represents the period net changes x periods ago.
So if you want the most recent 12 months, then the current column would be 'NET_M' (or simply 'M'), last month would be 'NET_[1]M', two months ago would be 'NET_[2]M', and so on. Period selection is linked to the selected fiscal period and year on the toolbar.
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Regards,
Softrak Tech Support