THE REAL ESTATE (DEALERS AND DEVELOPERS) ACT OF 1987- PREPAYMENT CONTRACTS- ENTERED INTO IN BREACH OF PROVISION LAND TO BE FREE OF MORTGAGE NOT CONCERNED WITH CONSTRUCTION OR BUILDING-WHETHER PREPAYMENT CONTRACT VOID OR VOIDABLE-WHETHER CHARGE IN FAVOUR OF BOARD VOID- WHETHER MORTGAGOR REQUIRED TO COMPENSATE PURCHASERS BEFORE EFFECTING TRANSFER UNDER POWER OF SALE- PRIORITY OF MORTGAGE/CHARGE