Missing IfcGUID value on grouped elements

[niclas.anderssonYHLBL]

Hi.
When exporting an IFC, from our model, we have discovered that not every element gets a ifcGUID value printed to the parameter.
The elements that doesn't get a value are grouped and it seems to affect the outcome of our export.
Ungrouping the elements is at the moment not a solution at the moment.

Is there a way to get ifcGUID values to elements inside a model group? 

[ahjorn]

What exactly is included in your group?

Is it a multi-category group?

[niclas.anderssonYHLBL]

The groups contains a curtain wall with a door.