T 527/17 shows what appears reasonable and advisable in matters of deletion of claims.
In T 527/17 the board admitted the main and the second request but not the first auxiliary request.
Both the main and the second request result from the deletion of claims 7 to 9 (main request) and 6 to 9 (second auxiliary request) from auxiliary request 9A filed with the statement of grounds of appeal
The board held that these amendments do not change the patent proprietor’s case as put forward in its statement of grounds of appeal: they do not raise any new issue and stay within the legal and factual framework established at the outset of the appeal proceedings for the claims remaining on file.