Dani,
You are right that double 33 is not 52.
However the aircraft which is going to operate the route (different airfield) is a widebody and the max take-off weight (which it regularly operates at) ACN is exactly double the PCN. We got more airfields in our schedule were the ACN is much higher than the PCN.
The documents on the aircraft do indeed state the ACN. However we never (as far as I know) carry any specific approval documents (from the airport) to operate a certain type to an airport were the ACN is higher then the PCN.
The CFU case was just used as an example as more carriers operate A321's into that airfield so they will have the same issue.
Already sent an email to the CP.
John, thanks very much. Looking forward to his input.