Unconditional requisites are SYSMODs that are required in all functional environments. All the unconditional requisites for each SYSMOD must be satisfied. Unconditional requisites are those specified in the SYSMOD's ++VER statement PRE and REQ operands. A requisite is considered satisfied if:

• The requisite SYSMOD is already applied.
• The requisite SYSMOD is superseded by a SYSMOD that is already applied.
• The requisite SYSMOD is being applied.
• The requisite SYSMOD is superseded by a SYSMOD being applied.