Group not invoiced as all its units are not invoiced

What causes this issue?

There are one or more units of this group that are not invoiced.

System Response

The status of the group is not changed to <LS>Invoiced</>. The ABD
status will not be changed.

How to fix this error?

Once all the units of the group are invoiced, the status of the group
will automatically change to <LS>Invoiced</>.

Procedure for System Administrators

If the group status does not change to <LS>Invoiced</>, check the
application logs and contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.