Hi,
I want to apply field security on "Est.Revenue" field in Opportunity Entity in CRM 2013. Is there any solution to apply field level security on Default fields.
Field Level Security in CRM 2013 is only for custom fields.
with CRM 2015 it can be enabled also for system fields.
For CRM 2013 OnPremise there is an unsupported customization to enable the system fields:
http://weblogs.asp.net/gayanperera/crm-2011-field-level-security-for-oob-attributes
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