Changing Inventory Organizations when using a Purchasing responsibility.

I have a Master and Child inventory organizations. Both are associated with the same OU/SOB.

In the Purchasing Application, Financial Options, the master organization is defined under the Supplier - Purchasing tab, and the OU is the same as the Inventory Orgs.

The Master and Child orgs are associated with the responsibilities being used (Inventory, Purchasing Super User). When in the Inventory responsibility, the Change Organization function shows all orgs associated with that responsibility correctly.

If I use the Purchasing Super User responsibility, and attempt to use Change Organization, nothing happens, there is no LOV to choose from. I would expect the Child  and the Master org to be available for selection.