Hello Heinz,
Was your Premiere sequence built from a Blackmagic Preset?
If by any chance it isn’t ––
You can create a new sequence from the available Blackmagic presets. Use one that is a appropriate for your material, then from your previously edited sequence, select all and copy, then go to the new BM sequence and paste.
I am new to Premiere (a FCP switcher) so I could be way off base.
Good luck with your film.
Ron