XRl report showing all components in an assembly

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Hi Everybody
I have been asked by a client to create an XRL report showing the breakdown of all components in an assembly, including the components of sub - assemblies.

I know tthat there is a report within opera, but we need this though XRL for other information.
I have been trying to work a UDO to give me all in a singular list, but its not working.

If anyone has done this in XRL and can offer any assistance it would be great.
Many thanks in advance
Arline Watson
RBK Technology