Defining Number Ranges for Recurring Entry and Sample Documents 
Use
Sample documents are used as a reference when you enter accounting documents manually. They simplify document entry. You can post regularly recurring entries using the recurring entry program. To do this, the program requires a recurring entry document. Transaction figures are not updated by a sample document or recurring entry document. They are special documents that are only used to create accounting documents.
For sample and recurring entry documents, you need to set up special number ranges in every company code in which these special documents are used.
Procedure
Define Document Number Ranges under Financial Accounting Global Settings ® Document
® Document Number Ranges.

You cannot use these number ranges for your document types.
For more information on recurring entry and sample documents, see
Posting with Sample Documents and
Recurring Entries.