Projects Credit Memo

Hello

We have created credit memo by canceling the original invoice and interfaced that to AR.

For some reasons; now we want to void this credit memo in AR. But we are not able to find related 'Void' transaction type in the lov of AR transaction screen; although we have defined  'Void' transaction type for Credit memo classification.

Is there any reason why this should happen? Is there any other way to stop this transaction in AR?

Nikhil