Hello Veena,
This seems to be a rounding problem. When you enter the CC value with decimals, the back-end system can be changing this values to percentage, rounding the values and making them not to be exactly 100%. This is solved after enhancement package 4 for ERP 6.0.
Please refer to the note 1387485:
I think this one will solve your problem. Do not forget to enable the business function LOG_MM_MAA_1 in customizing in order to make this work.
Hope this helps,
Regards
Martin