You can block an invoice manually. You have two options when you enter the invoice:

• You can block an invoice by entering an R in the field Payment block in the document header data.
• You can block an item by selecting the Ma (manual blocking reason) field in the item list. When you post the invoice, an R is automatically set by the system in the field Payment block in the document header data. Manually blocked items are given the blocking reason Manual block (M).