title: SQL Server 2012 can't select UDT for column in table designer
body: <p>In a SQL Server 2012 database, I am trying to create a User-Defined Data Type that multiple tables will use. </p>
  
  <p>I created the data types, but then when I try to modify the existing tables (design view) I am unable to select the UDT I just created. I keep getting an error message 'Invalid data type.' I can't select it for a new column or new table, either.</p>