IFC export - loosing parameters varying rebar set

[Chaikampa]

When exporting reinforcement to IFC, variable parameters are omitted from my rebar schedule.

In my current project we dont deliver rebar schedules on paper, only an IFC model. The manufacturer then uses Solibri to extract the neccesary information from the model and order/produce the reinforcement.

The individual length for each rebar is shown in the revit schedule. But when I export to IFC, the parameter for bar length is missing in the IFC model.

I think the reason is that Revit processes the rebars first as a set with "variable" length, causing the loss of the values/parameter. And then splits the rebar set into separate objects in the ifc model.

So in the one instance where I might actually like the rebar sets to show as individual rebars in IFC, I loose one of the most critical values in the process. 

Reinforcement with varying length:

Revit schedule showing individual length:

IFC schedule without bar length parameter: