NAV 2017 table definition does not match SQL table

Hi,
I bumped into strange problem - NAV 2017 table definition in Development does not match table definition in SQL.
NAV 2017 CH, table 27 - Item. There is one more field in SQL table, this field is not included in Development Environment table. Field name is "Has sales forecast" (or similar).
Field is created when new company is initialised.
Problem occured after migrating to CU6.

I wanted to export nav data and import them into other database. Import is failing with message Cannot import the data because the table with the ID 27 in the specified file has different fields or key definitions than the application
database. Make sure that you are importing data into the same application as it was exported from.
Tried to synchronize table schema, verified objects in both databases...
Anyone knows, why SQL table has extra field not included in NAV table?

Thanks, Martin.