Hi Avik,
Is it necessary that the planned and actual cost should be equal for closing the project??
It is not necessary that your plan costs should be equal to actual costs when you close the project.
He needs to close the project and before that he wants planned and actual cost to be equal for closing..
I have come across such requirement and i have also seen that certain businesses also put in an additional check in place which wont allow you to close the project unless the plan is equal to actual. Sounds weird, but its a fact. So, what you can do is, create a general costs activity in your project (Call is as "Variance to Close Project") and plan the value that is the difference between your plan and actual costs. Plan it as a negative value, as in your case plan is greater than actual.
Follow the subsequent month end processes and let us know the results.
Regards,
Gokul