Powershell Invoke-Expression Parameter Trouble

Caller.ps1

Set-StrictMode -Version "2.0"

function ProcessContent{
      $FileName = Join-Path "C:\PATH\IN" ("{0}.JSON" -f $PlannedChanges.Anforderung.Changenummer)
      $PlannedChanges|ConvertTo-Json -Compress|Out-File -Encoding utf8 $FileName
      Invoke-Expression "C:\PATH\Skript\MoveHome.ps1 -changenummer $PlannedChanges.Anforderung.Changenummer"
}

Get-ChildItem "C:\PATH\IN" -Filter *.TXT | Where-Object{$_.FullName -ne $null} |`
ForEach-Object{
    ProcessContent
    }

MoveHome.ps1

param([string]$changenummer = "")
Set-StrictMode -Version "2.0"

Write-Output ("MoveHome - Processing: {0}" -f $Changenummer)

Seems everything is ok after putting script and parameters in quotes but I got caught by "throw" messing up different contexts.