Sage 100c Manufacturing Data Validation Error 401

After running a Data Validation Report in Sage 100c Manufacturing we received error 401:  "Sales Order Detail Qty XXX and Total Cost XXX does not match Transaction Detail Qty XXX and Total Cost XXX, Unit Cost XXX".  A Sage Knowledgebase article talks about this error.  View Document - Sage Knowledgebase  How does this error happen to begin with?

Thank you,

Brian