How to change link Shared Datasource in a Report?

[pitanni]

Hello everybody,
I have several relationships in this state (after a migration from a SSRS 10.0.5500.0:

How can I connect the correct Datasource knowing the path?

I'm trying to do it like this:
$datasources = Get-RsRestItemDataSource -RsItem $reportPath -ReportPortalUri $ReportPortalUri | Where-Object {$_.Name -eq $myDataSourceName}
$datasources[0].Path = $NewDatasourcePath
Set-RsRestItemDataSource -RsItem $reportPath -RsItemType Report -DataSources $datasources -ReportPortalUri $ReportPortalUri

But I get an error:
Failed to update data sources for ... Invalid data source specified: @{...}

Please help!!!