some of the field(s) were broken - error

some of the field(s) were broken - error

Hi all,
the automatic sync runs between CMR and Books went well without errors last light (every two hours) but now out of a sudden we get an error message: "Some of the field(s) were broken while syncing Items with Zoho CRM"
Opening the message is giiving us the sync history page, which is useless as we cannot see which fileds may be the root cause. And we did not change our field mappings - so what is going wrong here?
How can we get out of this?
thanks for all zour help!

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