Did you figure out the solution? I have the exact same issue in a Contoso environment. I checked the number sequence and Feature activation as mentionned in the other responses; all is OK. But when I click Process I get the same errors as you mentionned.
NEVERMIND: I checked number sequence for BOM which was fine. But number sequence for formula was set to MANUAL setting it to automatic fixed the issue
Have you enabled the feature for formulas in engineering change management as described on the next page? This page might have some more hints for you.
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