In MPD 15 page 7 it has the following two sentences in bold below :
When QH data is replaced this will be confirmed by MRSO to the Supplier (and/or Generator in
the case of export) and Transmission System Operator via email and /or telephone on the day
messages are intended to be re-sent. Any aggregation performed using the original data will be
reversed and any new data re-aggregated.
The first sentence is not entirely accurate. MRSO send a notification to the supplier on the next working
day after the replacement data has been sent.