Hi Daniel,
are you able to view the data from the kna1 from the table without using a view?
If so the error might be caused due to differences in your metadata e.g. your view only supports the standard table kna1 but it has some extra columns. At least this issue appeared when I tried to Install an RDS. As further Information you could also check what the run-time error in the st22 looks like.
Regards
Eduard