Although the Associated revenue tab on the Opportunity page does not have a remove button, it is possible to remove the associated revenue from the opportunity.
To remove associated revenue from an opportunity, follow the steps below.
1) Within the Associated revenue tab of the Opportunity Page, click the value in the Amount field (it is a hyperlink). This will take you to the Revenue Transaction Page. 2) Under the Application details section, click Go to revenue which will take you to the Revenue Application Page. 3) Click Edit Details > Opportunity drop-down > Clear the value > Save. 4) Go back to the Opportunity Page and notice that the associated revenue has been removed.