How to replace multiple values of an attribute

Hi,

I spent my whole afternoon searching for a solution for replacing all 
values of an attrbute by an array.

So what i got is basicly an reference $values to an array of my new 
values. I could iterate through the array using
foreach my $value (@$values) {...}

The code that works is:
my $mesg1=$backendConn->modify($dn,
                                        replace => [$attr, ["Hello", 
"Test"]]
                                         );

But i need to be more flexible and tried today a lot of variations of...
my $mesg1=$backendConn->modify($dn,
                                        replace => [$attr, @{$values}]
                                         );

This gave me the error...
Attribute <one of the values in my array> was not found in the schema 
definition.
inside the LDAP Server

$attr is a string that contains the name of the attribut.

Could somebody help me?
Oliver