In short, they said the report of "repeated time values within panel" is serious to handle the incorrect panel data in the Stata.So you must check your data whether it is a correct panel data.
You may get an idea to slove your problem using the above web page.
您好,谢谢您的解答。我的产品是六分位数据的商品代码来的,现在有个问题就是一种产品可能会在一年出口到很多不同的国家,我xtset product year的时候就会出现repeated time values within panel,但如果加上xtset product country year就会显示too many variables specified,卡在了这一步,请问这种需要怎么解决呢?