It would be better to use diagram in stead of just let the participants to write down the format. For example, a diagram from top to down AN-SS1Y1-ACR-SS1Y1-NM1-AP-APM-APE-TKTL-RFST;ER, etc. followed by date change, name chage, special request. to make us visually understandable at the very first time when we just look at one page and have a sens of Amadeus reservation system. 
Overall, the system is impressive and very useful. Thank you for offering FOC. 