Need EL Expression to make ONLY the Overall Summary Rating field read-only

Summary

Need EL Expression to make ONLY the Overall Summary Rating field read-only

Content

We have a need to make just the Overall Summary rating field read-only for certain managers in the documents during our calibration process.  We want the individual goal ratings fields to remain editable. 

The EL Expression below makes both the overall summary rating field and the individual goal rating fields read-only, when applied to the read-only field:

#{pageFlowScope.pRoleTypeCode eq 'MANAGER' and securityContext.userInRole['ANTHEM_MGR_LVL_45, ANTHEM_MGR_LVL_40, ANTHEM_MGR_LVL_30']}

I then tried this expression, trying to isolate the Overall Summary section but the results were that none of the rating fields were read-only: