问题如下：
Due to the global market economic changes, the market value of Potter Company’s emerging market equity portfolio significantly declines, which is now below the 10% minimum asset level in a composite. To comply with the GIPS standard, the firm must:
选项：
A.exclude the emerging market equity portfolio from the composite and remove its historical performance record of the portfolio.
B.include the emerging market equity portfolio but in a temporary account.
C.exclude the emerging market equity portfolio from the composite for the period that below the minimum asset level.
解释：
C is correct.
考点：3.A Composite construction-3.A.9
解析：条款3.A.9 If the firm sets a minimum asset level for portfolios to be included in a composite, the firm must not include portfolios below the minimum asset level in that composite. Any changes to a composite-specific minimum asset level must not be applied retroactively.
如果公司设立了一个关于可以被纳入某个composite的组合资产最小标准，那么对于小于该标准的组合便不能被纳入到该composite中。任何针对该标准的修改都不可以做回溯处理。
任何针对该标准的修改都不可以做回溯处理。
请问这句话怎么理解
