Trados does not allow multiple source languages per project so for any project that has bidirectional translations, such as English<->Spanish, multiple projects need to be created and then grouped. For every language pair you add the number of parallel Trados projects that needs to be created increases. Trados Support has confirmed this. My LSP normally work bidirectionally so managing multiple parallel projects, syncing information, compiling data, etc. is a drain on staff time.
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