The quantity that you are entering the invoice for is smaller than the difference between the quantity delivered to date and the quantity invoiced to date.
Note: This message category
can be changed in Customizing for Invoice Verification. This means that you
can receive an error message even though the message is defined in the
standard system as a warning message.
The following documentation only deals with the standard case.
The system has determined that the product of
Check your entry and correct it if necessary.