1. What's the difference between document type and billing document type?

2. What's the use of the field 'document type' during definiation of billing type? What's the effect if leave it blank / assign it with a document type?

3. Where can I define how the system number the billing documents, in both case using internal and external number range intervals?
 

1. In SAP all sales transactions are representred by documents. Document type is a generic term applicable to delivery / sales / inquiry / billing etc. e.g. if someone says "check in shipping / delivery  if document type is correct or not" it means you need to check the document types relevent for shipping/delivery processing.  Document type controls and links the process flow.   In billing process the documents used have distinct document types .
 
2.  The billing document type defines how the document would behave in the process chain. If you try saving the document you will come to know why it is necessary. You cannot create a document type without giving it a name. If you give it a name then you can use it afterwards.
 
3. In the billing document type definition (VOFA) itself you assign the number ranges to be used for the document type. Whereas it is defined through VN01.  In internal numbers system maintains the counter and generates document number internally when document is save. Current counter you can see in VN01 itself.  Whereas in external number ranges you can give the document number at the time of creation itself provided it falls in the assigned number range and is not yet used.
 
San

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