For the second time in four months, members of the Board of Representatives have voted to appeal a developer’s case that so far has gone against them in court. This time it involves Building & Land Technology, which earlier this year won a ruling in state Superior Court. A judge said the board does not have the authority to validate a protest petition from residents seeking to stop BLT from building a bigger high-rise in their South End neighborhood. The BLT case began after representatives last year rejected a Planning Board decision that would allow BLT to build denser housing on a 4.4-acre parcel it owns at Woodland Avenue and Walter Wheeler Drive, once home to trash hauler B&S Carting. Representatives and BLT have said the change would allow BLT to build 108 units per acre instead of the 29 units per acre allowed under the original density allotment.