Problem With Hatch Layer when Export Revit to DWG

[nduc-thang]

When I export drawings from Revit to DWG, I want the outer boundary lines to be on Layer A, and the inner hatch lines to be on Layer B (see Figure 1).

However, when I export from Revit to DWG, both the hatch and the boundary lines end up on the same Layer A (see Figure 2).
It seems that the hatch lines automatically inherit the layer of the outer boundary. 

Is there a way to set the hatch lines and boundary lines to export to different layers?
Please guide me if possible. Thank you, everyone.

Figure 1

Figure 2

[akshay_surveKTDLP]

Hi @nduc-thang, 

Thank you for reaching out on Autodesk Forum.

Please share more information on the following:

• Which element you are trying to export from Revit?
• How are you specifying layer A and B in Revit?
• Which categories/subcategories?

[nduc-thang]

Hi Akshay,

Thanks for your reply, here's more detail about my case:

1.
Element to export: I’m trying to export Floors from Revit.
2.
Layer A and B specification: In Revit, Layer A is defined through subcategory mapping when exporting to DWG (Figure 1), and Layer B is defined in Detail Items (Figure 2), because I think the Hatch belongs to Fill Region, which is under the Detail Items Category. I have tried changing some subcategories in Floors such as Surface Pattern and Cut Pattern, but it did not work.
3.
Categories / Subcategories
These elements belong to the Model Categories → Floors category. Currently, I am setting the hatch in Visibility/Graphics Overrides → Filter → Pattern (Figure 3).

That’s the detailed information about my case. I look forward to your reply. Thank you.

Figure 1

Figure 2

Figure 3

[nduc-thang]

Hi @akshay_surveKTDLP ,

Here is the sample file. Please have a look and support me. Thank you.

Thang

[akshay_surveKTDLP]

Hello @nduc-thang, 

Thanks you for sharing the sample file as requested. I will keep you informed with the further updates.

[akshay_surveKTDLP · Accepted solution]

Hi @nduc-thang,

If the surface pattern is from a material assigned to the floor, it goes to the surface pattern sub-category layer. If it comes from a filter, it goes to the overall floor category.

The other sub-categories have to do with the multi-layer behavior of the floor which is only visible in section.
This is the standard behavior for the floor exported to DWG.