All standard deeds of sale or offers to purchase used by estate agents contain spaces for completion relating for example to the purchase price, the date of occupation, the Occupational rental payable, etc.Often disputes arise from allegations of alteration after signature by both parties. Or the contract was signed incomplete. Often this does not reflect the correct agreement reached between the parties.It is important to complete the contract before signature by the parties. Fill in or cross out and initial any open spaces. Include all guarantees or assurances in the written agreement. It is no use stating afterward that any parties made assurances or gave guarantees. Always get it in writing.Each party should make a copy of the contract immediately after signing it and then keep this copy in their possession. Once signed the parties should make copies as proof of the specific terms and conditions of the contract.