How to use GraphicsV 7 (Vet)

I am trying to use GraphicsV Operation 7 (Vet) to check whether a video mode is suitable to run on my BB xM.

Therefore I am preparing a VIDCList Type 3 structure of words for one mode. I can’t see that I am doing anything wrong (Wordoffset 4 seems to be unused according to description?!!? I am setting it to 0). However calling an according OS_CallAVector by SYS from BASIC (Ten registers seems to be possible even 8 are allowed in accordance to BASIC manual) always return a non 0 value even the mode can be definitely used on the BB xM.
Any ideas what I am doing wrong?

(Wordoffset 4 seems to be unused according to description?!!? I am setting it to 0).

Documentation error – it looks like I skipped a number when writing up the docs. Word 4 should be the the horizontal left border, word 5 the horizontal display size, etc. Try changing to use that structure and it should work.

Many thanks for the hint Jeffrey. Setting the words continously did the trick! My program is now working correctly.