When you are creating a Sales Order (from the Create Sales Invoice for Maintenance functionality) you can specify more than one Customer for who you want to create this document.
Do do this you need to use the Assist Edit button in the Customer No. field. It will open the list of all customers. There you can select needed records.
After confirming - the proper value will be added to the Customer No. field.
When documents are created - the list with these sales orders is open.
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