Well, this happened. If a birth/wedding/death occurred in another parish than where it "ought" to have happened, the parish where this physically happened didn't note it in their own books but just sent a letter to the "correct" parish. This becomes truly confusing in the 20th century, when more and more women gave birth at a hospital. E.g., a child physically born in parish A (where the maternity hospital was) to a mother living in parish B. This child was reported as being born in parish A but wasn't noted there but was noted in parish B - with no explanation that it wasn't born there but born in parish A. So if you look up this person in the censuses or the death index, this person is supposedly born in parish A (that was after all how it was reported) - but there's no record there. Instead you have to know where the mother lived at the time of giving birth and check those parish records... And how do you know where someone lived in the 1930's?!?