Only Special Ledgers that are compliant with the new General Ledger can and should be transferred to the new General Ledger. If you use additional currencies in a Special Purpose Ledger and want to replace this Special Purpose Ledger with the new General Ledger, you have to check the currencies used in the Special Purpose Ledger. The migration programs read the data in the original FI document. If the Special Purpose Ledger you want to replace uses a currency that is not contained in the original FI document, you cannot migrate this data to the new General Ledger. In this case, you must keep the relevant Special Purpose Ledger.