Why VAOs in Tamil Nadu are refusing to give "Ownership Certificate"("Urimai Chandrithal")?

Recently I was asked to provide Land Ownership Certificate from revenue department to register my ancestral property. So I approached my village VAO for this. VAO refused to give it by saying "Collector has ordered not to provide it for past 2 years. And the VAOs and Thasildars who gave were jailed in the past". Note : I have all supporting documents from Revenue Department. If giving the document is illegal or punishable, then why registration department is asking for this? What could be the possible reasons for this?