Can a member formula fetch a number from an external table to display in a cubeview report

umber and a cube datacell number displays side by side. It is like doing a recon between two systems. Has anyone ever done that? I know

Hello!
The cubeview can only check the values in the cube itself. So having in a column a number coming from an outside system will not work. My understanding here, is that the data you need to compare with it outside OS.
Is this number stored anywhere in OS?