Reordering the engine – scrapping premium at risk?

Hello, I’m thinking about reordering from 1.6 to 1.4 l TSI. Well my question, I received the reservation confirmation from BAFA. Is the scrapping premium endangered by reordering an engine and you have to reapply the scrapping premium? The data of the engine are different when submitting the copy of the new vehicle certificate as when booking over the internet. It is as example no change of the radio that nowhere on the new vehicle my unobstructed delivery date is July 2009. Will this be postponed when a possible re-order is made? Who has some experience? Since I am new to the motor talk I hope that this topic was not already present somewhere. If I’m sorry, I’ll be glad to receive your answers.