Got an AY cash voucher as compensation of IRROPS and now experience following:
-It is possible to split a voucher to pay several tickets, i.e. if some euros are left from first booking, the rest can be used on another ticket
-It is not possible to use the voucher if other currency: I try to book ex-ARN and it does not give me option to use the voucher

(which made me book SK as the AY price went up while I was sorting out things "^^")