Activate open item management

Hello Experts:

I know this topic has been discussed several times. However, I am posting again since I want to check with my specific scenario and system profile and settings. Please provide your expert opinion on this topic.

We are on 4.6C

We have a problem where a Balance Sheet GL account was created initially with Open Item Management inactivated, Line Item Display activated and items posted to the account. The account has a zero balance. The requirement is to activate the Open Item Management which would enable clearing of the items. So, even though the account is showing a zero balance, system is not letting activating of Open Item Management since it has items posted to the account. Client does not want to open a new GL account in order to transfer the balance.

My questions are:

1. How can this be done since transferring balance is not an option (since it shows a zero balance)?

2. Can the items posted, be transferred to a different account and get this done? (is it possible to transfer the line items to a different GL account?

3. Does the RFSEPA programs need to be run to accomplish this and if so what is the right way to do it?

Please reply with specifics taking consideration of our specific situation. I appreciate your expert assistance on this.

Thank you,

Munair