My apologies, the truncation may be due to trying out Safari on Windows but attaching the wrong example was my fault.
If you open this example and enter =SUM($H$1:H15)*C17% into a cell you will see the error.
Avoiding the problem isn't really an option, we want Excel formula compatibility.
I assume from your reply that GridControls use a specialise CalcEngine in the background? Is it possible to access that one in my code? Can you point me to the location in the source where this is implemented?
Thanks,
Ben
VirtGridMultipleDataSources1.zip