Party could be a person or an organization which has no business relation with your entreprise if you establish a sales relation with a department in a party then that particular department is your customer.
In AP Unposted Invoice Sweep process is used to transfer invoices and payments from one period to another. Invoices on hold will not post and therefore need to have the G/L Date changed to the future period before the current AP period can be closed. Run with Sweep Now parameter set to ‘No’ for Preliminary report. Confirm that invoices to be swept do not have to be posted to current period. If invoices are listed for Sweep rerun with Sweep Now parameter set to ‘Yes’ for Actual sweep.