CrossCompany ChangeCompany in AX how to get the record from different companies

Cross company and Change company

Job
PurchTable purchTable;

select forupdate crosscompany purchTable
where purchTable.PurchId == purchId;
if(purchTable.PurchId)
{
changecompany(dataArea)
{
purchTable.OneTimeVendor = Noyes::Yes;
purchTable.doupdate();
info("The purchase id %1 is updated successfully",purchTable.PurchId);
}
}