Symptoms

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When attempting to insert a row on a m2m list inside of an embedded list as a non admin, there is a good chance, you will receive a security constrain error.

The error will say, "Security Prevents Writing to this Field" below the search field.

 

 

Cause

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The reason this is happening is that there is a global (*.none) ACL for list edit which has a role of Admin.

This will restrict the use from editing the list is they are not an admin which is what they are doing in an embedded list adding a row.

 

Resolution

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Create a new list edit ACL which is for the table that is in question that follows the best practices of your business requirement.