Pricing-formula: Add value of items with Reason for Rejection in the Basis calculation

Dear all,

My requirement is the following:

I have an Freight cost condition type applied on the Total amount of the Sales order.

I need to take into account for this basis amount also the items with Reason for rejection:

Example:

Freight cost: 0€ if order is 150€ and more,

Item 10: 140€

Item 20: 20€ : no stock --> Reason of rejection put:

As it is not customer fault, we want to give him the freight cost for free.

How would you code this in the Pricing procedure formula?

Kind regards,

Sebastien