While creating new flight or working on Schedule change, you may face below case to clear another agent who is on the partition which is represented by LNIATA.
Therefore, since you cannot proceed your activity please use below entries to clear the LNIATA's from the partition:
In CERT partition: KASKGT1ETCERTCL/CFDD24
In TSTS partition: KASKDT1ETTSTSCL/CFDD24
In PROD partition: KASKGT1ETPRODUCTIONCL/CFDD24
KASKGT1 - is primary entry to clear the LNIATA
ET - Carrier code, in this case it will be our ET'
CERT, TSTS & PRODUCTION - The partitions on which you are working,
CL - represents Clear'
CFDD24 - is the LNIATA to be cleared.