Create an AEL function in ADS

Hi,

I want to define a personnal function in ADS by using AEL file, this function is called in the dds file of the project.

This function uses 3 parameters : Gain, compression and Pdel_dBm, which are computed from schematic by using usual equations (0.5*real(VxI*)....)

I have to take these data as explain in the picture.

But I encouter some difficulties to create this function.

I give a jpeg picture to describe my problem, could you take a look for me?

thank you for you help