What defines a CRUD

Well I am working with a table and everytime I try to generate the CRUD for this table:
Cidades:
ID int(11)
NOME char(120)
ESTADO int(11)
COD_MUNICIPIO int(11)
COD_MUNICIPIO1 char(4)

It does not generate a Create or Edit page. I would like to know ... what criteria does Radzen need to follow to create , a create page?

You need primary key.