在merge合并时  出现这种情况怎么处理：<br>
(note: variable Stkcd was str6, now str12 to accommodate using data's values)
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(note: variable Accper was str10, now str12 to accommodate using data's values)
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(note: variable Typrep was str1, now str12 to accommodate using data's values)
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variables Stkcd Accper Typrep do not uniquely identify observations in the using data<br>
不知道怎么改  求指点