For any FI document to be generated, it is essential that a document number is assigned. Hence for each transaction type, number ranges are defined. The allocation of number ranges is made at company code level. Document numbers can be internally generated wherein you need to stipulate the start number and end number or it can be externally numbered in which case you need to check the box titled Ext.
If it is internally generated, the system automatically assigns the document number based on the number range once u post the document. Where it is external, the user is expected to state the number for the document to get posted.
Various number ranges can be used for various transaction type. You can also find the "Current Number" which indicates the last number used.
Assign points if the explanation clarifies your query.
Bluesky
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