Hi Dongmei,
SNP Prod Horizon- SNP does not create any planned orders, SNP deletes all unfixed SNP planned orders from previous planning runs within this horizon.
Extended Prod Horizon- This horizon is an extension of the SNP Production Horizon. However, in
contrast to the SNP production horizon, you can manually create SNP planned orders in this extended horizon in interactive Supply Network Planning.
Could you please elaborate your question?
Regards