Richard,
A few years back I worked for a small division Lockheed Martin. The company
had been formed by the acquisition of three smaller companies. After the
merger a single MRP system was put in place, and the three old data bases
were merged on a "blanket" ECO. A cross index for all three P/N systems was
generated and a new set of p/n generated, all of the bom conversions were
done in software.
I never found a bom that didn't have errors from this conversion.
A couple of things that would have helped;
-Retain the "old" P/N in the description field or whatever. They didn't and
it doubled the work of cleaning up the bom's.
-Bring the BOM's into the system one at a time. One Doc. control clerk could
have kept a week ahead of our production schedule working part time. Humans
are just better than software sometimes.
-Move or re-vamp the stock room. We found a bunch of  "orphaned" (not called
on any BOM) materials this way.

Hope you find this helpful,
Dan

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