October 20 (SeeNews) - Croatian fertiliser producer Petrokemija [ZSE:PTKM] said on Tuesday it has fully repaid its outstanding debt of 412 million kuna ($64 million/54 million euro) due for old natural gas supplies to oil and gas company INA [ZSE:INA-R-A], natural gas importer Prvo Plinarsko Drustvo (PPD) and state-owned energy utility company HEP.