Custom Properties to allow Blueprint requestor to define IP address and select a network

Hi,

I have a property definition which defines

VirtualMachine.Network0.Name

This provides a dropdown list with predefined values, by which a requester can select a network to which they wish to connect their VM. This works perfectly and the VM requested is connected to the respective vSphere port group.

I am trying to combine the above property with the

VirtualMachine.Network0.IPAddress

I have this setup to allow the requester to specify an IP address. Whatever the requester put's in the form the IP address is simply assigned from the network profile and the user specified address is ignored. This happens whether I configure the above property in a Property group or directly on the blueprint via custom properties.

Any ideas?