Zero + gap constructions (Value 4) are not found in relative clauses, but this construction is rather common in clefts, which otherwise have the same structure as relative clauses:
ì be atʃampɔŋ [ opin dis haiwe ]
3SG COP Acheampong [ open this highway ]
'It was Acheampong who opened this highway.'
Source: Huber 1999: 183
Source: Huber 1999: 194
Source: Huber 1999: 185