Unable to create a Decision Model in PCS

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Hi team,

            As we created four decision boxes in which one is of decision table box, one is of if-then-else box and the rest two are of expression boxes. The problem occurs when we are creating Input data named Subject and inside that we are defining new data type named Subjects under which the subject names are described with datatype numbers as we want to calculate total score and percentages of them (Screenshots attached with decision boxes) . 

         As we proceed towards the Total Score decision box and type the input data type(Subject) along with subjects names , to calculate, the error being shown are  "Cannot interpret path : Subject.English", "Name not found:Subject".