void markSelected()
{
    inventTrans inventTransSelected;
    inventTrans inventTrans4Update;

    ttsbegin;
    inventTrans4Update.setTmpData(inventTrans);    //DIES IST NUR BEI TEMPORÄREN TABELLEN NOTWEDNIG
    for (inventTransSelected = inventTrans_ds.getFirst(true) ? inventTrans_ds.getFirst(true) : inventTrans_ds.cursor();
         inventTransSelected;
         inventTransSelected = inventTrans_ds.getnext())
    {
        select firstonly forUpdate inventTrans4Update
        where inventTrans4Update.RecId == inventTransSelected.RecId;

        inventTrans4Update.Marked = NoYes::Yes;
        inventTrans4Update.update();
    }
    ttscommit;

    inventTrans_ds.executeQuery();
}