Professional use percentage higher than professional use (light goods vehicle)

I have purchased a light goods vehicle that I use 70% for professional use.

For VAT deduction, I want to use a flat-rate percentage, applying guidelines for 35% (not predominantly professional) or 85% (predominantly professional). In this case, I would prefer 85%.

When I enter this, I get the next error message:

‘The VAT deduction percentage must be less than the professional use percentage’.

This does not seem correct to me in this case. Is there a possibility to use 70% professional use % and 85% vAT deduction %?

Thank you in advance, Kind regards