Table control in BDC

Hi all,

I have to upload the consumption values in forcasting view in MM01 where it is only taking last 11 months values but not more than that..it is in table control.

could any one plz suggest how to do that ..

steps are

goto mm02

then forcasting view..click on consumption val..there i have to enter last 15 months values.but it is not letting me ,,plz advice how to handle that.

Thanks in advance.

Suresh.