Unable to copy Row ID of Custom Object 5 to External Unique ID field in Custom Object 5
I am trying to copy the Row ID of the Custom Object 5 record into the External Unique ID field in the Custom Object 5 object itself.
In the External Unique ID field set up in the Custom Object 5,i have tried to set the default value of this field using the following option
1. CustomObject5Id
2. Using the joinfieldvalue function
Joinfieldvalue('CustomObject5>',[<CustomObject5Id>],'CustomObject5Id')
Why does not OnDemand not allow to copy the row id of the Custom object 5 record in another field like External Unique ID in the same object.
Within the Opportunity Object, there are only 4 fields of the Custom Object 5 that are displayed in the list layout.