Manager reference in Soren PowerShell MA

Hi All,

I get managerid as a string from our Authroritative source(SAP) .managerid is  employeeid of the manager and it is the anchor attribute. All the values are imported successfully but having issues with manager reference.

If I define managerid as reference variable,mangerid gets deleted in CS. How do i add the manager reference ?

Schema Script

new-object -typename psobject -prop @{
    "anchor-EmployeeID|string" = ""
    "objectclass|string" = "user"
    "firstName|string" = ""
    "lastName|string" = ""
     "managerId|string"=""

}

Import Script

foreach ($User in $UserData.Users.User)
    {
        
        $obj = @{}
        $obj.personIdExternal = $User.personIdExternal
        $obj."[ObjectClass]" = "user"
        $obj.firstName = $User.firstName
        $obj.lastName = $User.lastName
        $Obj.managerId=$User.managerId
        $obj
    }

Any advise would be appreciated. Thanks!!