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丹 朱丹 朱 

How to set the look up conditions on the two fields with each other value?

I have two objects(A_object and B_object), A_object has two fields(A_field and B_field),the two fields has the same reference relations(B_object.C_field).
A_object.A_field -> B_object.C_field
A_object.B_field -> B_object.C_field
Now,I can set A_object.B_field's look up conditions with A_object.A_field’s value.
Conversely, A_object.A_field can't set.

How to set the look up conditions on the two fields(A_field and B_field) with each other value?