hodrick prescott filter in eviews model

[Enian]

I am trying to run a model in eviews. It includes a production function identity with TFP generated as residual. I want to apply a hp filter on the generated TFP series to use in the potential GDP equation. I know it is possible to input hp filter command in the command window of eviews. But I can not apply in a model text. When trying to solve the error window appears.
Is there a formula for hp filter command that can be written in the model??

thank you in advance

[trubador]

http://forums.eviews.com/viewtopic.php? ... 559&p=5427