Unassigning a Bill plan assigned to multiple Contract lines

Hi,

This questions pertains to Contracts module.

1. A user created a Contract and had included two Contract lines for the same Product ID (Rate based product).

2. Unknowingly, he assigned the same Bill plan B101 to the two Contract lines. Transactions were also processed and the Bill plan status is currently In-progress.

3. As the Bill plan was assigned to two lines, the current linkage will double count all the Billing and Revenue reports. Now the user wants to unlink Contract line 2 from this Bill plan.

Can someone tell me the steps to unlink the Bill plan from Contract line 2 only? Is it feasible?