ePDM BOM's versus SW BOM's

One of the engineers came to me this morning with the following issue;

He built an entire assembly in SW2012 SP4 in the ePDM vault. No problem and then added the BOM in SW to his drawing of the assembly. Next, he opened the BOM tab in ePDM (also 2012 SP4) for the assembly and the BOM QTY's do not match between the 2 BOM's. He has done no editing so at least I would think, the BOM QTY's should match between the two. If anyone has any clue what's going on let me know. Thanks

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