Problems with Mirrored 'Tablulated' components in Assembly.

Hello all,

One of our contractors is creating assemblies usingcomponents/sub-assemblies I have created using a design table. Whenhe mirrors one of the assemblies, and tries to insert the mirroredversion (-20) into the BOM on the drawing, he gets a 'parameter isincorrect' error. We have also had issues with some fastenerconfigs on his machine.

I am wondering if there might be an issue with Excel:
I have created the files in XL 2007
He has XL 2003

Has anyone else experienced this?
Does anyone have any ideas/suggestions?

Any help much appreciated!
Thanks,SolidworksDrawings And Detailing