The document number assigned in transaction KANK is dependent upon a couple of factors like the activity used to update the CO file and the number assigned within the controlling area.

Which number range to used will depend on the group which you have assigned by their CO activity.

Click the Group button to check the various CO activity that have been assigned to each group of number range.

SAP FICO Reference Books:
SAP Financial and Controlling Interview Questions, Certification and Configuration, Books

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SAP Controlling

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SAP FI (Financial Accounting) Configuration Hints and Tips

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips