If there is a limit it certainly not just two. Is it possible that you referenced the second spreadsheet, saved your file, closed it, moved the second spreadsheet to another location, then opened your spreadsheet with it pointing to the old location?
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Kenneth Wonderley
http://www.wonderley.com...the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control.
Galatians 5:22 & 23