[kashperuk]

Можно

// If '_mapField' and '_tableField' are empty:     true if the '_mapId' map have a mapping for table '_tableId'
// If '_mapField' is not empty:                    true if the '_mapId' map have a mapping for it's field '_mapField' for table '_tableId'
// If '_tableField' is not empty:                  true if the '_mapId' map have a mapping for table's field '_tableField' for table '_tableId'
// If '_mapField' and '_tableField' are not empty: true if '_mapField' is a mapping for '_tableField' on map '_mapId' for table '_tableId'
static public boolean mappingExists_RU(tableId _mapId,
                                tableId _tableId,
                                fieldId _mapField   = 0,
                                fieldId _tableField = 0)
{
    boolean          ok;
    Map              map = MappingsInfo_RU::createMapWithFieldId( _tableId, _mapId);
    identifiername   fieldName;

    ;

    if (! map.empty())
    {
        if (_mapField || _tableField)
        {
            if (_mapField && _tableField)
            {
                fieldName = fieldid2name(_mapId, _mapField);

                if (map.exists(fieldName) && (map.lookup(fieldName) == _tableField))
                {
                    ok = true;
                }
            }
            else if (_mapField)
            {
                if (map.keySet().in(fieldid2name(_mapId, _mapField)))
                {
                    ok = true;
                }
            }
            else if (_tableField)
            {
                if (map.valueSet().in(_tableField))
                {
                    ok = true;
                }
            }
        }
        else
        {
            ok = true;
        }
    }

    return ok;
}