references to variable in another schema

Hi folks:

I wanted to put a reference on a table in the public schema that
references a column in a table in another schema. I tried:

create table cellphone(emplid integer not null references
admin.tbl_employee.employee_id);

ERROR:  cross-database references are not implemented:
"admin.tbl_employee.employee_id"

But these are within one database. Is there a way to do this or have I
gotten my syntax messed up?

Mija