public static int GetDictionaryMaxNr(DictionaryTypeEnum dictType, int unitId, DatabaseContext db)
        {
            var result = db.DictionariesValues
                .Where(x =>
                x.DictionaryTypeValue == dictType &&
                x.EntityStatus == EntityStatus.esActive
                )
                .OrderByDescending(x => x.Nr)
                .Select(x =>
                x.Nr);

            int count = result.Count();

            if (count == 0)
            {
                return 1;
            }

            if (result.Max() != count)
            {
                //pierwszy "wolny" nr
                foreach (var nr in result)
                {
                    if (count != nr)
                    {
                        return count;
                    }
                    count--;
                }
            }

            return count + 1;

        }