Tall cabinet oven built-in - back panel does not fit

Hello,

I have a 233cm tall cabinet in which I want to install an oven. My design has two drawers at the bottom, then the oven, then the panel, then a 92cm cabinet door. According to the instructions, I only need to nail the back panel at the top because there are drawers at the bottom. Now here comes the problem: According to the instructions for the oven, a board must be inserted at hole 17 and hole 36. However, the upper back panel does not reach the top board. There is a gap of about 10 cm between the board and the back panel, and I can only nail the back panel at the top edge: consequence -> unstable

2 questions:
Why is the upper back panel too small?
Does another shelf need to be inserted at the top edge of the panel so that a hollow space is created between the oven and the top edge of the panel?

Thank you very much for your help

Martin

1. I don't know, was that the largest of the supplied back panels?

2. It makes no sense if the bottom is flush with the lower edge of the panel. Then everything would be uncomfortable to take out from the compartment above. Set the bottom 3 holes higher and ignore the specified hole numbers.

Yes, I took the larger of the two back panels.

If I move the top plate a few holes up, the cover no longer fits. Or does the top edge of the cover have to end exactly at the shelf?

Thanks for the help

You should be able to pull things out of the cabinet almost without an edge, like with any other cabinet with doors. The floor can or should therefore also be a bit higher. Basically, you can do it however you want as long as you are satisfied with the result. Due to the different floor supports, "intermediate hole heights" are also possible.