Solution : https://service.sap.com/sap/support/notes/626429 (SAP Service marketplace login required)
Key words :
note prevents cash discounts basically, automatic purchase order generation, lfm1-zterm reason, day limit require, cash discount percentage, net document type, purchase order, cash discount, posting net, goods receipt
Related Notes :
205649 | Net posting during GR to purchase order w/ freight |