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Key Concepts: A supplementary invoice is a type of invoice used in the SAP CRM-BE Billing component. It is used to supplement an existing invoice with additional information or to correct an existing invoice. Supplementary invoices are typically used when the original invoice contains incorrect information or when additional information needs to be added. How to use it: In order to create a supplementary invoice, the user must first open the existing invoice in the SAP CRM-BE Billing component. Once the invoice is open, the user can then add additional information or make corrections to the existing invoice. Once all changes have been made, the user can then save the supplementary invoice. Tips & Tricks: When creating a supplementary invoice, it is important to ensure that all changes are accurate and complete. Additionally, it is important to ensure that all changes are properly documented so that they can be easily referenced in the future. Related Information: For more information on supplementary invoices and how to use them in SAP CRM-BE Billing, please refer to the SAP Help documentation. Additionally, there are many online resources available that provide detailed instructions on how to create and use supplementary invoices in SAP CRM-BE Billing.