Some more common mistakes, which are always happening.
Dlist formatted items can be used as virtual dimesions, but they allways have Force-to-Zero Option. Therefore
That’s very good, what IID1 + IID2 mean, anyway? (even if it’s IID29 :-))
But when you link 2 cubes and want to transfer a calculated value, you link a source virtual dimension (that’s an allocation link, but nothing lies in this terminology), you will transfer ZERO (that’s for Fill mode, using Substitute saves previous values). Because on virtual dim you get zero value on calc cell = no allocation possible. common mistake.
Only detail values can be transfered using virtual dims.