CRYPT TEXT message received and decrypted to PLAIN TEXT at ZL1ANY

EIGHTY YEARS AFTER ADMIRAL KARL DOENITZ ORDERED UPGRADE FROM THREE ROTOR ENIGMA MACHINES HERE FIRST TWO WAY EXCHANGE BY AMATEUR RADIO IN ZL USING VIRTUAL KRIEGSMARINE  FOUR ROTOR MACHINES  X   QSL UD END X

ZL1ANY composed his PLAIN TEXT reply, encrypted it then sent
 

CRYPT TEXT message received and decrypted to PLAIN TEXT at ZL3TK

MESSAGE ZERO KHREE RECEIVED IN CODE OF ADMIRAL DTENITZ STOP SEVEN THREES  BSO

For those interested in testing the accuracy of this message, three errors will be found:  two incorrectly recovered letters and one departure from correct protocol.  

 Explanation for three errors