Attribute naming rules
Adhere to the following rules when creating attribute names. Attributes are validated against these rules so that there are no conflicts in the database, such as duplicates or the use of Oracle reserved words.
Limit the length to 30 characters.
Begin the name with an alphabetic character.
Use only ASCII, alpha, numeric, or underscore characters in the name. Spaces and special characters other than underscores are not allowed in attribute names, although they are allowed in the list of values (LOV) for an attribute.
Names are not case-sensitive.
Do not use Oracle reserved words. See http://docs.oracle.com/cd/E15817_01/appdev.111/b31231/appb.htm. To list the Oracle reserved words, use this SQLPlus query at the command line:
SQL> SELECT * from v$reserved_words;
Attribute names within a domain hierarchy must be unique.