SAP Message VO026 - Problem in number assignment

Diagnosis
Here you are dealing with the number range object &V1&, the numberrange interval &V2&, and the cause of the error &V3&.
The error causes have the following meanings:
1 = Number range interval for object not defined
2 = Number range not internal
3 = Number range object not defined
6 = Number range interval used up, re-use not possible
7 = Non-foreseen error
8 = Non-foreseen error

System Response
The picking wave cannot be created.

Procedure
In cases 1 through 6, the respective Customizing entries should becorrected. Inform the person responsible for Customizing settings oryour system administrator.
In cases 7 - 8, this is probably an error in an ABAP/4 program. Contactyour system administrator.