Field Mapping between CRM (Salesforce) and Marketo currently remains in perpetuity, disabling the Marketo Admin's ability to remove (or merge) a field if it has ever been mapped to a Salesforce field. A client of mine was just informed on a support call that this field mapping cannot be deleted from Field Mapping, and once a Salesforce field has been mapped it must remain.
Salesforce admins consistently over-permission fields to the Marketo Sync User, which creates incredible amounts of technical debt and sync backlog issues for Admins. Our current solution is to get our Salesforce admins to remove Field Level Security (FLS) permissions from within Salesforce, which addresses only part of the problem. However, we have no means in Marketo of removing the field association within Marketo Admin so that we can remove the technical debt (the field that was errantly created) on our side.
Please allow Marketo Admins, either via Support or via a UI mechanism, to be able to delete or remap fields in the UI outside of the initial sync. This is a limitation for admins that needs to be addressed.
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