DB Transporter: Duplicate Key

Hello,

i'm using version 8.2.1.
Some months ago I transported the schema from TEST environment to PROD environment.
In the meanwhile I extended the schema moreover and I modified (deleted and re-created) some custom columns.
Now i'm trying to import the schema again to apply the changes on the PROD db, but (righly) i receive the following error:

Import 'D:\Transport\Transport.zip' failed.
Error applying changes to database.
Database error 2601: Cannot insert duplicate key row in object 'dbo.DialogColumn' with unique index 'QBM_XA2DialogColumn'. The duplicate key value is (CCC_EnteAziendale1, LDP-T-LDAPAccount).
The statement has been terminated.
Cannot insert duplicate key row in object 'dbo.DialogColumn' with unique index 'QBM_XA2DialogColumn'. The duplicate key value is (CCC_EnteAziendale1, LDP-T-LDAPAccount).
The statement has been terminated.

The problem, i think, is that I deleted a column and I recreated it with same name, so I have two different UIDs for the same column (same column name in dialog column).

How do you manage this use case i.e. to transport a schema twice when have been made modification between them? Because I used the module "Transport schema extension", but I've this problem.

Thanks, 

Roberto