Assign quantity for account &

What causes this issue?

In CO you want to analyze differences between the plan and posted
quantities for account &V1&. You can only do this if you specify a
quantity for each posting.

System Response

The SAP System reminds you to enter a quantity and unit of measure, but
allows the posting if the entries are not made. In CO, the SAP System
records in the totals record that a posting was made without a quantity
specified.

How to fix this error?

Enter a quantity and unit of measure if you can.
If this is not possible, consult the accounts department to check
whether quantities must be recorded in account &V1&. This can be fixed
in cost center planning or order planning and changed if required.

Error message extract from SAP system. Copyright SAP SE.