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

• The requisite SYSMOD is already accepted.
• The requisite SYSMOD is superseded by a SYSMOD already accepted.
• The requisite SYSMOD is being accepted.
• The requisite SYSMOD is superseded by a SYSMOD being accepted.