Hi Sadi,
I agree Vadim, you do not need extra dimension for time. You can "report" in Bex analyzer with this format but BPC reporting/input schedules is not dynamic enough. Because you can not use property in axis but in Bex it is possible. Maybe you can change input form design because where is other contex in your form, 2012.01 what, price or stocks or sth? You have to specify account and entity. I think it is useless design to input data. I added figure for sales model. In this figure, you can manage actual / budget with "if" and "today" excel formulas. And you can easily link your olap member in column axis. I think it will help you.
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Best regards
Haşim.