oncePerMissionAction.sqf

// init.sqf
if (hasInterface) then {
    superobject addAction [
        "Einmalaktion XYZ",
        {_this remoteExecCall ["mission_fnc_actionXYZ", 2]},
        [],
        1.5, true, true, "",
        "_target getVariable ['mission_actionXYZEnabled', true];",
    ];

    mission_fnc_actionXYZ_local = {
        params ["_target", "_caller", "_actionId", "_arguments"];

        systemChat str _arguments;
    };
};

if (isServer) then {
    mission_fnc_actionXYZ = {
        params ["_target"];

        if !(_target getVariable ["mission_actionXYZEnabled", true]) exitWith {};
        _target setVariable ["mission_actionXYZEnabled", false, true];

        _this remoteExec ["mission_fnc_actionXYZ_local", _target];
    };
};