Regarding costing on production order

Dear All,

We are having MTO scenario. We have one byproduct (semi finished), the quantity for which is uncertain.It might be very huge sometimes or might be zero. My questions are what is the impact of the byproduct if it does not come into picture? What is the impact if I do costing run through CK11N? What is the impact on production order settlement? Also kindly explain what are the document those are created after settlment. We have standard price for all finished and semi finished products.

Expecting timely and descriptive answers.

SmanS