APO SNP capacity levelling heuristic

I am using APO V5 SNP.

I have a question about SNP capacity levelling heuristic.

As I understand it, the heuristic works on a resource by resource basis and will aim to capacity level across time buckets.

But suppose I have a product which has two different sources of supply (PDS/PPM) using different resources X and Y.

Suppose the capacity using resource X is overloaded for week n, but resource Y is not overloaded.

Can the levelling heuristic be used to move capacity from resource X to resource Y for week n, or would this have to be done manually via changing the PDS/PPM?

Thanks,

Bob Austin, Atos Origin