Hi Eva,
it is already said in the note
g) Before starting the production startup, close all manufacturing orders and create new orders after the upgrade. For already existing production orders, there is no connection to the material ledger quantity structure tool during the production startup. That means that these orders are not taken into consideration during multilevel calculations.
and the same is true for product cost collectors
h) Furthermore, the production order history is not translated into the parallel currency at production startup. This leads to problems when reversing goods movements at the latest because the value of goods received in the additional currencies is calculated incorrectly. Consequently, problems also occur when you settle product cost collectors. For this reason, close the product cost collectors before you activate the material ledgers and then create it again.
In principle you can go on with the old product cost collectors, but they will not be fully supported by the ML closing, and values in additional currencies might be inaccurate, perticularly during goods movement reversals or for order settlements.
So accurate actual cost results for the products produced with the product cost collectors will only result if you follow the advice in the note.
best regards, udo