Very likely the Marketo use does not have write access to the fields in question. SFDC does not take the update, but returns a null value. I can be because the Marketo user rights are not set correctly of because these fields are formula fields, for instance.
Thank you , this was actually the case ! It's solved now
Le lun. 30 avr. 2018 à 17:59, Grégoire Michel <email@example.com>
a écrit :
<https://nation.marketo.com/?et=watches.email.thread> The Marketo
Marketing Nation Community
Re: Salesforce synchronization issue: some fields set to "null" after
reply from Grégoire Michel
in Products - View the full discussion
Pls mark the question as answered, for future reference.