When a crop plan proposal is accepted, edit the crop plan header and set the status on the crop plan to Closed-Won.  This will remove the crop plan details from the sales forecast until it is booked in the ERP.  

Next, book the deal in your ERP.  For some customers this means emailing the crop plan PDF to accounting.  For others it means that the agronomy rep should book the crop plan in the ERP.  

See the main crop plan page for additional details.