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Paying Grid Usage Invoices 
With this business process, you (in the role of the supplier, for example) can pay the grid usage invoice and create a payment advice note.
Incoming bill processing must have been completed successfully. An aggregated posting must have been made to the market partner’s (distributor’s) contract account.

The following process runs in SAP R/3:
...
1. Post payment
The aggregated document on the market partner’s (distributor’s) account is cleared with a payment run.
2. Create payment advice note
A payment advice note containing information on the paid individual bills is created for the payments. The payment advice note is sent to the market partner to help him to clear individual receivables.
Aggregated documents on the market partner’s account were cleared with a payment run, and a payment advice note was created.
The market partner can process incoming payment and payment advice notes.