Option class component item not accepting any quantity other than 1

Hi,

We are testing some scenarios for which we created a structure where parent item is "Model" and component item is "Option Class". So this is option class under model structure. Whenever we choose quantity value for the component item other than 1, it is giving me an error.

Error: You must enter a maximum quantity for the component that's more than the quantity per assembly.

Can anyone assist us on why option class component in structure is not taking any other quantity than 1?

Regards,

Gaurav