Inconsistent Flow Sequence in Fired Heater (HYSYS model)

[Pinjer]

Hi Engineers,

Does anyone know or have any ideas of specifying flow sequence in Fired Hetaer (with HYSYS EDR model)?

I have built a rigorous fired heater with HYSYS model, I have a problem to add new stream to the model. When I have the model solved, and try to create/add a new stream in either Convection or Radiant and Economizer Section I got error message from my EDR "The specified flow sequence, through convection banks and/or the fire box is inconsistent"

Thanks in advance for your help.