YMM_NOT_DELIVERY is a home made report, not SAP standard, Z and Y are custom name space.
Nobody here can evaluate how bad your own report got developed.
I have already difficulties to understand how it is possible to have a date of 30/2
My uncle is born on 29/2 and this happens only every 4th year. 30/2 was the last time in 1712 in Sweden, it is not yet known when it will be the next time.