# Base Surface Name for Shading surface is wrong in IDF exported

I found that the "Base Surface Name" for a Shading:Zone:Detailed object is not correct in the IDF exported from OpenStudio.

Examples is shown blew in which the two shading surfaces belonging to different base surfaces have the same base surface name.

Can the OpenStudio team kindly check and advise on this problem? Thanks!

This is important since I need to refer to the Base Surface Name to get the thermal zone and its origin so that it can be added to the shading surface vertices coordinates to recreate the surface in other software ...

```
Shading:Zone:Detailed,
Sub Surface 3 - Overhang, !- Name
Surface 2, !- Base Surface Name
, !- Transmittance Schedule Name
, !- Number of Vertices
4.9746, -0.606158571082195, 1.97231714216439, !- X,Y,Z Vertex 1 {m}
4.9746, 0, 1.97231714216439, !- X,Y,Z Vertex 2 {m}
0.0254, 0, 1.97231714216439, !- X,Y,Z Vertex 3 {m}
0.0254, -0.606158571082195, 1.97231714216439; !- X,Y,Z Vertex 4 {m}
Shading:Zone:Detailed,
Sub Surface 6 - Overhang, !- Name
Surface 2, !- Base Surface Name
, !- Transmittance Schedule Name
, !- Number of Vertices
5.60615857108219, 0.0254, 1.97231714216439, !- X,Y,Z Vertex 1 {m}
5.60615857108219, 4.9746, 1.97231714216439, !- X,Y,Z Vertex 2 {m}
5, 4.9746, 1.97231714216439, !- X,Y,Z Vertex 3 {m}
5, 0.0254, 1.97231714216439; !- X,Y,Z Vertex 4 {m}
```