Hi,
I am trying to compare my model (reverse-engineered from a ddl script and slightly modified afterwards) with an existing schema in Oracle DB and obtain an ALTER script. I press "synchronize data dictionary with model", then I choose my connection and observe object tree. Apparently there is a difference:

After this I press "DDL preview" and expect to see an "alter table FACT_FREIGHT_CARS" script there, but for some reason the window is empty and no script is generated:

Is there a specific reason for this?
I am using SDDM 4.0.2.840.
Thanks,
Kirill