add cut refs vector

src/plugins/bellman_functions.jl

@@ -519,6 +519,9 @@ function transfer_cuts(model::PolicyGraph{T},oldmodel::PolicyGraph{T}) where {T}
     node_name_parser = _node_name_parser
     cuts = Dict{String, Any}[]
     for (node_name, node) in oldmodel.nodes
+        if !haskey(model[node_name].ext, :cut_refs)
+            model[node_name].ext[:cut_refs] = []
+        end
         if node.objective_state !== nothing
             error("Unable to write cuts to file because model contains " *
                   "objective states.")
@@ -530,8 +533,12 @@ function transfer_cuts(model::PolicyGraph{T},oldmodel::PolicyGraph{T}) where {T}
             "risk_set_cuts" => Vector{Float64}[]
         )
         nscuts = size(node.bellman_function.global_theta.cut_oracle.cuts,1)
-        for i = model.ext[:naddcuts]+1:nscuts
+        for i = 1:nscuts
             cut = node.bellman_function.global_theta.cut_oracle.cuts[i]
+            if cut.constraint_ref in model[node_name].ext[:cut_refs]
+                continue;
+            end
+            push!(model[node_name].ext[:cut_refs], cut.constraint_ref)
             cut_coef_aux = copy(cut.coefficients)
             for (ky,val) in cut_coef_aux
                 cut_coef_aux[ky] = val
@@ -541,7 +548,8 @@ function transfer_cuts(model::PolicyGraph{T},oldmodel::PolicyGraph{T}) where {T}
                 "coefficients" => cut_coef_aux
             ))
         end
-        model.ext[:naddcuts] = nscuts        
+        #model.ext[:naddcuts] = nscuts 
+        model.ext[:naddcuts] = model.ext[:naddcuts]+1       
         for (i, theta) in enumerate(node.bellman_function.local_thetas)
             for cut in theta.cut_oracle.cuts
                 cut_coef_aux = copy(cut.coefficients)