Field help (TCAMANCOU) 

When an indicator is set to Yes, the manual entry of the document number is also authorized, the counter intervenes only if the number has not been entered.
SEEWARNINGThis field is not always accessible and can be forced to No when the manual entry of a document number is not possible (usually, internal documents whose numbering does not depend on external constraints).
The setup of this field is not significant for the counter of the Assets module, because the manual and/or automatic allocation of the numbering is managed independently, for each object, by a general parameter.

SEEREFERTTO See the documentation on the Counter assignement for further information.