Displaying Payment Directive Data 
You can display payment directive data from various sources:
Display an invoice from the Create Payment Directive transaction FMPO
Display a payment directive and an invoice from FI standard transaction FB03
Display FM documents from the payment request display transaction F873
Note
The invoice number is stored in the field BSEG-REBZG of the payment directive.
You can display documents for payment directives in the following ways:
Display invoice from transaction FMPO Create Payment Directive
From the payment directive, you can navigate to the invoice document. For this, double-click on the invoice number in the payment directive output list, or put the cursor on it. If your cursor is on the document, you can also display it via:
the icon Show Document
the menu
If you have selected an invoice, the FI standard transaction FB03 is called to display the document.
If you want to display a payment request, proceed as above, but put the cursor on the payment request instead. Now the function module FI_PSO_DISPLAY will be called.
Display payment directive or invoice from FI standard transaction FB03
ViaSAP main menu , you can also navigate from a payment directive to the invoice and vice versa:
If you want to display a payment directive from the invoice, go to the line level of the document and double-click on the invoice number in the field Invoice ref.
If you want to display an invoice from a payment directive, first call up the posted payment directive for it. For this, display the vendor’s line of the invoice, go to the menu and select Environment and then Invoice status , in order to display the documents that reference this invoice.
Display FM documents (FM update) from payment request display transaction F873
For this, go to the SAP main menu:
Here you can display the payment request . However, if you select Environment → Accounting documents , you can also navigate to the FM update screen, on which you can see the amount type for every line.