Bosch HEN301.1S Instruction Manual page 23

.
Caution. Incorrect assembly: never move the rail before
the two hooks are secured fully in the upper holes.
The enamel can become damaged and break.
2
. Correct assembly: the two hooks must be inserted fully
into the upper holes. Now move down the rail slowly and
carefully and insert into the lower holes.
3.
Insert both rails.
If the rails are fitted correctly, the distance between the two
upper shelf positions is greater.
23