I may have a workaround for this, but would like an expert opinion.

I changed the single inner shading surface into two surfaces so they shared edges with another surface.

```
BEGIN ORIGINAL
BuildingSurface:Detailed,
Inside Shelf, !- Name
WALL, !- Surface Type
Shelf, !- Construction Name
Daylit Zone, !- Zone Name
Surface, !- Outside Boundary Condition
Inside Shelf, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
0.0, !- View Factor to Ground
4, !- Number of Vertices
1.0, !- Vertex 1 X-coordinate {m}
0.0, !- Vertex 1 Y-coordinate {m}
2.0, !- Vertex 1 Z-coordinate {m}
4.0, !- Vertex 2 X-coordinate {m}
0.0, !- Vertex 2 Y-coordinate {m}
2.0, !- Vertex 2 Z-coordinate {m}
4.0, !- Vertex 3 X-coordinate {m}
1.0, !- Vertex 3 Y-coordinate {m}
2.0, !- Vertex 3 Z-coordinate {m}
1.0, !- Vertex 4 X-coordinate {m}
1.0, !- Vertex 4 Y-coordinate {m}
2.0; !- Vertex 4 Z-coordinate {m}
END ORIGINAL
BEGIN MODIFIED
BuildingSurface:Detailed,
Inside Shelf Top, !- Name
Wall, !- Surface Type
Shelf, !- Construction Name
Daylit Zone, !- Zone Name
Surface, !- Outside Boundary Condition
Inside Shelf Bottom, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
0.0, !- View Factor to Ground
4, !- Number of Vertices
1.0, !- Vertex 1 X-coordinate {m}
0.0, !- Vertex 1 Y-coordinate {m}
2.0, !- Vertex 1 Z-coordinate {m}
4.0, !- Vertex 2 X-coordinate {m}
0.0, !- Vertex 2 Y-coordinate {m}
2.0, !- Vertex 2 Z-coordinate {m}
4.0, !- Vertex 3 X-coordinate {m}
1.0, !- Vertex 3 Y-coordinate {m}
2.0, !- Vertex 3 Z-coordinate {m}
1.0, !- Vertex 4 X-coordinate {m}
1.0, !- Vertex 4 Y-coordinate {m}
2.0; !- Vertex 4 Z-coordinate {m}
BuildingSurface:Detailed,
Inside Shelf Bottom, !- Name
Wall, !- Surface Type
Shelf, !- Construction Name
Daylit Zone, !- Zone Name
Surface, !- Outside Boundary Condition
Inside Shelf Top, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
0.0, !- View Factor to Ground
4, !- Number of Vertices
1.0, !- Vertex 1 X-coordinate {m}
0.0, !- Vertex 1 Y-coordinate {m}
2.0, !- Vertex 1 Z-coordinate {m}
1.0, !- Vertex 2 X-coordinate {m}
1.0, !- Vertex 2 Y-coordinate {m}
2.0, !- Vertex 2 Z-coordinate {m}
4.0, !- Vertex 3 X-coordinate {m}
1.0, !- Vertex 3 Y-coordinate {m}
2.0, !- Vertex 3 Z-coordinate {m}
4.0, !- Vertex 4 X-coordinate {m}
0.0, !- Vertex 4 Y-coordinate {m}
2.0; !- Vertex 4 Z-coordinate {m}
END MODIFIED
```

I removed the inside shelf from the DaylightingDevice:Shelf

```
BEGIN ORIGINAL
DaylightingDevice:Shelf,
Shelf, !- Name
Daylit Upper Window, !- Window Name
Inside Shelf, !- Inside Shelf Name
Outside Shelf, !- Outside Shelf Name
Shelf; !- Outside Shelf Construction Name
END ORIGINAL
BEGIN MODIFIED
DaylightingDevice:Shelf,
Shelf, !- Name
Daylit Upper Window, !- Window Name
, !- Inside Shelf Name
Outside Shelf, !- Outside Shelf Name
Shelf; !- Outside Shelf Construction Name
END MODIFIED
```

These changes got rid of my Zone="DAYLIT ZONE" is not fully enclosed Warning, while only making these two warnings.

```
**Warning** GetSurfaceData: CAUTION -- Interzone surfaces are usually in different zones
** ~~~ ** Surface=INSIDE SHELF TOP, Zone=DAYLIT ZONE
** ~~~ ** Surface=INSIDE SHELF BOTTOM, Zone=DAYLIT ZONE
**Warning** GetSurfaceData: InterZone Surface Azimuths do not match as expected.
** ~~~ ** Azimuth=90 ...
```

(more)