Attaching a data partition is allowed unless IMPLICITVALUE for a specific column is a non-null value 
for both the source column and the target column, and the values do not match. In this case, you must drop 
the source table and then re-create it. A column can have a non-null value in the IMPLICITVALUE field if one of 
the following conditions is met:

* The column is created as the result of an ALTER TABLE...ADD COLUMN statement
* The IMPLICITVALUE field is propagated from a source table during attach
* The IMPLICITVALUE field is inherited from a source table during detach
* The IMPLICITVALUE field is set during database upgrade from Version 8 to Version 9, where it is determined to be 
  an added column, or might be an added column. If the database is not certain whether the column is added or not, 
  it is treated as added. An added column is a column that was created as the result of an ALTER TABLE...ADD COLUMN statement.

To avoid these inconsistencies during non-migration scenarios, it is recommended that you always create the tables 
that you are going to attach with all the columns already defined. That is, never use the ALTER TABLE statement to add 
columns to a table before attaching it.