Meaning of "capped to"

English as a Second Language English Vocabulary, Grammar and Idioms
1

Dear All,

Can you please tell me what “capped to” means in this statement:

“Salary progression is capped to the next higher level above the salary level attached to the post”

Thank you in anticipation.

2

‘Capping’ is instituting a maximum. The highest salary attainable for the current post is the salary level of the next position above this one.

3

Thank you so much for your help Mister Micawber. Given your response, what preposition should follow this word? Would it be for example:

Salary progression is capped at the next higher salary level OR
Salary progression is capped to the next higher salary level?

4

I would expect ‘at’, though your sentence uses ‘to’.