Not possible to translate a record when allowLanguageSynchronization is set for relation field like 'image' in tt_content
tt_content record of type image in default language with one image (default language en)
translated tt_content record in one language with individual image(s) selected in this record (language dk)
translate the record in a third language with selecting the translated (dk) record as source.
A translated record is created with sync set to translation source
exception is thrown and image(s) in dk record is multiplied