Ndc cancellation,

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I obtained Ndc from DHA Lahore to sell my plot in prism. This ndc was submitted in dha office for issuance of challan form for payment of transfer. Challan wZ in my name. The purchaser deposited transfer fee. However he could not arrange the amount for payment of plot price. I now want to apply to dha for cancellation of NDC.
Is it necessary to get ndc cancelled.
Secondly, What is the text of Affidavit to be submitted to dha on stamp paper.