Implications moving column from single-select to multi-select?

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Are there any implications change a column from single-select to multi-select? Even though I'm not changing the Column Name, when I change a column from single-select to multi-select, any reports with those particular columns don't work any longer (says "Column Not found"). Then I have to manually go into each report that uses those columns. Is there any workaround to this? It seems like if I'm not changing the Column Name, it should be smart enough to know that it should consider it the same column within reports if I'm only switching from single-select to multi-select. Any other implications that I'm not considering?

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