作收货时报错：Posting only possible in periods 2002


Posting only possible in periods 2002/11 and 2002/10 in company code 1000
Message no. M7053

Diagnosis
The posting date entered is not within one of the permitted posting periods (current period/previous period).

This can be due to one of two reasons:

The correct current period has not been set in the system.
For the system, the first of the entered periods is the current period. At the beginning of a new period, your systems administrator must change the current period in the material master record, using the function "Shift periods". This has not yet been done.
You have entered a wrong date in the field "Posting date".
Procedure
Check the posting date and correct it if necessary.
If your input is correct, inform your systems administrator that the "period shifting" (period-end closing) process has not yet been completed.

R3提示可能是两个原因：
1、The correct current period has not been set in the system.
表示不理解，因为我在当前2008.05已作过很多AP发票了，应该不是什么账期没有打开吧。
using the function "Shift periods". ？？？是指什么操作？？？
2、You have entered a wrong date in the field "Posting date".
我输入的过账日期是2008.05.15。

处理：
inform your systems administrator that the "period shifting" (period-end closing) process has not yet been completed.
难道是因为我的会计年结没有处理完？？？

等待，谢谢。