Is it possible to cancel the Operative indicator selection once project released

Dear PS Guru's

I have one issue, by mistake i selected the "Operative indicator as "Billing element" and i release the project at higher level and posted all actual costs. As per my settlement profile, my entire cost is settled to "FXA". when i am going to settle my cost system throw an error message.Settlement from revenues / debit side down payments to receiver FXA is not allowed.

Now my question is how i can deselect the Billing element operative indicator from my lowest level wbs element. Please suggest me about on this.

My projects are purely capital investment projects.

regards

JK