IMO, this is not an error.
30130 is the correct number for the dragon wing in this assembly, since it is made of transparent plastic.
It is stated inside that file:
There are many of these combinations. Like:
50746 "Slope Brick 31 1x1x0.667", correct number for transparent colours
54200 "Slope Brick 1x1x0.667" correct number for opaque colours
You have to keep the different aliases apart.
Sometimes an alias is transparent/opaque, and sometimes it's a new partnumber.
30130 is the correct number for the dragon wing in this assembly, since it is made of transparent plastic.
It is stated inside that file:
Quote:0 // Alias of 6133
0 // Part 30130 is the transparent counterpart of 6133
There are many of these combinations. Like:
50746 "Slope Brick 31 1x1x0.667", correct number for transparent colours
54200 "Slope Brick 1x1x0.667" correct number for opaque colours
Quote:0 !HELP Part 50746 is the counterpart of 54200. Visually, the two parts seem
0 !HELP identical. This file is provided to make it easier to locate part files
0 !HELP when using the numbers from other sources.
0 !HELP 54200 is used for moulding opaque parts, 50746 for transparent parts.
You have to keep the different aliases apart.
Sometimes an alias is transparent/opaque, and sometimes it's a new partnumber.