The easiest way to do this is with a query. Is the record source for your report already a query or is it a table?
In your first post you said if the total of the Actual Qty and Under Issued Qty is equal to the Estimated Qty you don't want it to show, then in the last post you said when the Actual Qty and the Under Issued Qty are equal so I'm not sure which one you need.
If it's the first one, in the Estimated Quantity field, enter the criteria:
<>[ActualQty]+[UnderIssuedQty]
The query will only return the records where the Estimated Quantity plus the Under Issued Quantity is not equal to the Estimated Quantity, so the unwanted rows will not even be brought into the report.