Enterprise Custom Field populated in PWA. Data is not populated in Desktop

I have created a resource Enterprise Custom Field called "Role".  The new field shows up on the "Edit Resource" page in PWA.  I populate the field with a value (it is a text lookup type using the "Role" lookup table).  When I open the resource in Project Desktop, the field is there, but the value I entered in PWA is not there.  It is just empty.  If I update the value in the Desktop, it stays.  Why is the value not showing up in the desktop when I populate through PWA?