Environment:

Oracle B2C Service Versions, MySQL 5.6, 5.7, and 6.0

Resolution:

MySQL has reserved keywords that should be avoided in custom field, custom object class, or attribute naming. The user interface blocks known reserved keywords in most cases. However, as customers migrate between MySQL versions, the reserved words change and customers that were not affected could become affected by a new reserved word.

Please find the list of reserved words added here: MySQL Keywords and Reserved Words and rename your custom field, custom object class, and/or attribute names that match a reserved keyword.