Variable Substitution in File splitting / Multi mapping

Hi SDNites,

Sender structure is

Row

  --Field1

  -- Flag

Receiver 1 Structure is (Based on value of flag Receiver 1 or Receiver 2 is triggered)

Field2 (Mapped to Field 1 of Sender)

Receiver 2 structure is

Field3 (Mapped to Field 1 of Sender)

Variable substitution has to be applied on receiver side. Have used it like payload:Field1,1. But is is not working. Please suggest.

Regards,

Abhishek