CRM 2013: Update a read-only field value using Business Rule

Question

I'm trying to calculate a date field value based on another field, using the Business Rule feature in CRM 2013. The field is locked on the Form so that the user cannot modify. I think because of this setting, the field value is bet set initially however when I click the 'Save' button the value disappears.

I believe this is the same as setSubmitMode("always") issue for read-only fields. I am wondering if there is a way to resolve this issue inside the Business Rule or Form/Field settings ?

Answer 1

I'm having the same problem but I found this workaround:

The workaround is to add the locked field twice on the form. Make 1 instance of the field 'read only' and 'visible' and then make the 2nd instance of the field NOT 'read only' and NOT 'visible' on the form. then when the Business Rules fire it will see that one of the instances of the field is not read only and then save to the database.

Source: https://social.microsoft.com/Forums/en-US/741916de-e637-40f1-a675-944e7c0f5130/crm-2013-business-rules-updating-read-only-fields?forum=crm