Purchase order to Jobs

Good morning, I have been looking for information and documentation regarding the following question and I have not found the answer.

When I place a purchase order for a Job, I selected within the order line the item, quantities, Job, Job task and ... Job line type, example budget, billable or both. The problem comes when I select the Job line type, it does not matter whether I select billable or budget, the line that will be created in the selected Job task will always be both, budget and billable. This increases the budget that we already had allocated.

Is there any way that the line that is generated is only billable?

I really appreciate your time.