[A] In order to change the document number from automatic to manual, go to Settings module and scroll down document format number

[B] Search and click on the document name for which you want to make the changes, it will expand and show the your current document series.

[C] Select the "Manual" option available inside the box and click on "Save" button.
Your setting has been saved, now you will get option to manual type the document number.   

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