पश्चात्प्रतिज्ञाते द्विगुणः प्रस्मृतोत्पन्ने च ॥ कZ_०२.७.४० ॥
paścātpratijñāte dviguṇaḥ prasmṛtotpanne ca
If (the falsehood/denial) occurs after having earlier acknowledged/undertaken (the claim), the penalty is double; likewise when it arises after being reminded or after recollection.
Because it signals deliberate bad faith rather than mistake; it wastes administrative time and undermines reliability of commitments.