pass marked records to another form in D365FO

[DataSource]
    class ActivityLogDetails
    {
        /// <summary>
        ///
        /// </summary>
        public void init()
        {
            super();

            if (element.args() && element.args().caller() && element.args().record())
            {
                this.query().dataSourceTable(tableNum(ActivityLogDetails)).clearDynalinks();
                helper= MultiSelectionHelper::createFromCaller(element.args().caller());
                helper.createQueryRanges(this.query().dataSourceTable(tablenum(ActivityLogDetails)),fieldstr(ActivityLogDetails, RecId));

                if (element.args().menuItemName() == menuItemDisplayStr(MarkSalesActivityLogReserved))
                {
                    activityLogStatus = ActivityLogStatus::Reserved;
                }
                else if (element.args().menuItemName() == menuItemDisplayStr(MarkSalesActivityLogRejected))
                {
                    activityLogStatus = ActivityLogStatus::Rejected;
                }
                else
                {
                    throw error("@SYS22996");
                }
            }
            else
            {
                throw error(Error::missingRecord(tableId2PName(tableNum(ActivityLogDetails))));
            }

            Ok.enabled(false);
        }

    }