Error message using FILESTREAM to save documents

I am trying to use FILESTREAM for saving documents in the database. I have a table containing these columns:

The domains are defined as folows:

When I insert a document using T-SQL in SQL Mangement Studio in the GUI I see the documents as expected and can also open them using the lookup button. When I try to upload a new document I get the folowing error message:

This makes sense because the filestream_id is inserted with a null value, running the same command in SQL management studio without the field filestream_id and the null value works because the field has a default value (newsequentialid()).

What should I change to make the GUI surpress the filestream_id field?