I am trying to call an API to calculate date in a custom menu but I think I am doing some syntax error.

Can someone please let me know how to put parameters in an API call in IFS ? I saw that in the API definition out of lets say 16 parameters 6 are IN OUT type of parameters so I am putting just the 10 IN type of parameters.

Can someone please suggest me what is the right way to do the above mentioned task in terms of syntax and stuff ?