Field collection Config (multi value)
Field1---Name -Autocomplete (single value) (Entity Reference)
Field2---Score - Computed field.
Example Values for field collections
Field collection [0]
------Bill (1112)- where 1112 is nid
------Score - some value will be generated depends on 1112
Field collection [1]
------Roger (1345)- where 1345 is nid
------Score - some value will be generated depends on 1345
Field collection [2]
------Roger (1467)- where 1467 is nid
------Score - some value will be generated depends on 1467
..
..
Field collection [n]
------Maddy (1652)- where 1652 is nid
------Score - some value will be generated depends on 1652
From above config how to make field Name's value should not hold the duplicate value for field collection ie Bill should not be applied again.
There is a module called https://drupal.org/project/unique_field which forces field's value to be unique per content type or per all node, but not per field.
In above case somehow(that what is required) if we make per field then also it could only applied to Name field which is inside field collection rather than field collection itself. Right?