Payment Blocking and Payment Directives 
Use
For the invoices that are customized to be paid through a payment directive, you can use the payment blocking function in the FI transaction FB03, Display FI Document.
Prerequisites
Payment directives must exist that can be blocked.
In the Implementation Guide, you must specify the payment blocking reasonunder
Financial Accounting 
Accounts Receivable and Accounts Payable Business Transactions
Outgoing Payments Manual Outgoing Payments Check Payment Block Reason 
.
Features
In transaction FB03, you can branch to the vendor data screen by clicking on the corresponding line.
The relevant field is ZLSPR (Payment Block Key) in table BSEG, in the vendor line.
During the posting of an FI document, a Business Transaction Eventis executed automatically for the invoice in the form of an interface, which checks the customizing for payment directives. If the invoice being posted requires a payment block, the field ZLSPR in table BSEG is filled with the key derived from the Customizing of the payment directive. Furthermore, the system checks that the payment block entered also blocks manual payment.
Note
If you have set a manual payment block, and an invoice is blocked automatically due to differences in the invoice items, the system sets a manual payment block in the vendor line of the accounting document.