Attempting to apply CA Mainframe VM Product Manager 1.2 PTFs published after RSU-1901 (PTF SO10980), VMSES/E reports the PTF(s) cannot be applied because PTF SO10976 is a pre-requisite and is not applied.
PTF SO10976 is installed by installing CA Mainframe VM Product Manager 1.2 RSU-1901 (PTF SO10980) and you do not have RSU-1901 installed.
Install CA Mainframe VM Product Manager 1.2 RSU-1901 (PTF SO10980); then install the PTF(s) that require PTF SO10976.