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FirstBit Hotline Knowledge base > Error while creating a new document "The Value "OO-999" of the field Number is not unique" > image2025-9-26_14-20-35.png

The issue is connected to that fact that current prefix for Customer oredr document was filled (due to the system architecture - 1 prefix may contain 999 documents).
So for solving your issue you should cheange prefix for Customer Order document - and system would start counting document numbers again.

How to do it:
open Administration - Service Settings:

FirstBit Hotline Knowledge base > Error while creating a new document "The Value "OO-999" of the field Number is not unique" > image2025-9-26_14-22-27.png

And here you need to change Prefix for customer order document type:
you should open Document prefixes link - system will show window with Document Prefixes informational register. And you need to find Customer order in list and change prefix for new one (for example to CusO ).

FirstBit Hotline Knowledge base > Error while creating a new document "The Value "OO-999" of the field Number is not unique" > image2025-9-26_14-23-30.png

Warning:
After saving it - you should log out from the system and log in back (for the setting to be applied) and check new numeration of Customer Orders documents.

Thank you for being FirstBit Customer!