Attempting to apply CA VM:Schedule 2.0 PTFs published after RSU-1901 (PTF SO11030), VMSES/E reports the PTF(s) cannot be applied because PTF SO11018 is a pre-requisite and is not applied.
PTF SO11018 is installed by installing CA VM:Schedule 2.0 RSU-1901 (PTF SO11030) and you do not have RSU-1901 installed.