The column data type defined by default in the database can`t be changed, it will always revert back to the original data type. This is because the database in sitefinity is managed by ORM (sitefinity uses OpenAccess ORM
) the ORM will always revert the default values of the table type
The DB type of a field can`t be changed, if the case in which this field is used is in a module built with the module builder (Administration->Module builder) add new field to the module in order to change its DB type. If the field which Db type is to be changed is one of the built in fields in sitefinity, this change can`t be done.
Please let me know which field in which module you want to change and if possible I will offer a workaround.
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