Billing in SAP GUI 
You trigger billing from the billing due list in the SAP GUI if you want to do the following:
Use variants to run collective billing
You can define and save variants, which predefine a set of selection parameters for billing.
Bill individual transaction items rather than complete transactions
Recommendation
If you want to trigger billing manually for complete transactions, or schedule a one-off collective billing run, we recommend that you do this in the CRM WebClient UI, on the Billing Due List page.
You can find the billing due list on the SAP Easy Access screen under .
Note
In the Default Data area on the selection screen, you can enter new billing parameters (billing type and billing date) that override any values predefined in Customizing (the billing type is defined in billing customizing, and the billing date in transaction customizing).
These alternate parameters are applied to the billing documents that are created during billing.
You have the following options:
From the selection screen, bill all billing due list items matching your selection criteria, by choosing Bill.
From the selection screen, start a collective billing run for all billing due list items matching your selection criteria, by choosing Collective Run.
Select items for individual or collective billing, or schedule a collective billing run as follows:
Once you have entered your selection criteria, you choose Maintain to display the billing due list.
Items blocked due to item category customizing are marked with a yellow triangle. Items not marked with a yellow triangle were blocked in the transaction/delivery.
You can display detailed information for the blocked billing due list items by expanding the business transaction and double-clicking on the required item. Or you can select the item and choose Display Item Details.
To bill one or more items, you select the relevant items and choose Individual Billing, Collective Billing, or Online Collective Billing.
Retrieve saved selection criteria using a report variant, by choosing .
Save your selection criteria as a new report variant, by choosing .
Icons in the billing due list show the processing status of items:
Green: billing was successful
Yellow: you have not yet executed billing for the item
Red: billing was unsuccessful (errors occurred)
If the system cannot successfully execute billing, it creates an error log. To view this, choose Display Error Log.
If you have executed one or more collective billing runs, you can also display the collective run log by choosing Display Collective Run.
In the CRM WebClient UI, you can see the results of background processing on the Collective Run Log page or access the log from the Billing Due List page.
You can display a billing document as soon as it has been created by selecting an item, clicking on the right mouse button, and choosing Display Document.