Special Number Ranges for Recurring Entry and Sample 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.
Sample documents are used as a reference when entering accounting documents manually, thus simplifying document entry. Regularly recurring postings can be made automatically by the recurring entry program. To do this, the program requires a recurring entry document. Transaction figures are not updated with the sample document or recurring entry document. They are special documents that are only used to create accounting documents.
Special number ranges must be used so that the system can distinguish these documents from accounting documents. The number range for sample documents is defined under the two-character code X2, the number range for recurring entry documents under X1. 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.