Calendar link in set analysis

[Taylorcc]

Hi everyone, 

I am using this set analysis which is working perfectly fine -

=count({<Referral_Number = p({<[ServiceContact_K10+_ ServiceContact_ReasonForCollection]={"Episode start"}>})
* p({<[ServiceContact_K10+_ ServiceContact_ReasonForCollection]={"Episode end"},
Calendar ='Referral_End_Date',
Referral_CompletionStatus-={"Episode Open"}
>}) >}
distinct Referral_Number)

I need to add - Calendar ='Referral_End_Date' to the set analysis but can not get it to work 

Any ideas? 

Thank you