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Need to export in a Step file but mates are gone from assembly

Question asked by Jodi Renne on Oct 11, 2011
Latest reply on Oct 11, 2011 by Kelvin Lamport

I am in need to export an assembly into a step file but my mates are gone when i re-open the step file.  What am i doing wrong?  How am I suppose to send the assembly file to a customer?