You may find necessary to synch a multi value attributes to a single valued attribute from LDAP to AD. Taking all the values, making a long string using a "#" as separator and then putting them in a single value attribute.
For example you want to synch the values from a multi value LDAP attribute called ‘physicalDeliveryOfficeName’ to an AD attribute called ‘roomNumber’:
1) Select as target "physicalDeliveryOfficeName" attribute;
2) Instead of selecting "roomNumber" attribute as source use "Generated by script";
3) Use the script as follows:
$result = $null