ID:20300 WYSIWYG LCELL_COMB primitive "<name>" cannot use carry-out or sum-out when extended mode is on.

CAUSE: You made a WYSIWYG LCELL_COMB primitive with the EXTENDED_LUT parameter set to ON and using sum-out or carry-out port. This is not supported.

ACTION: Modify the design to change the EXTENDED_LUT parameter to OFF, or disconnect the sum-out and carry-out ports.