The Catholic Bishops Conference of Papua New Guinea has sent a message to all MPs to stop the misuse of constituency development funds.
The conference has called for an end to the current system of allocating the so-called slush funds to MPs to distribute.
The bishops say that ahead of next year's general election, there are increasing signs of these funds being used by MPs for electioneering and personal profit.
The Conference's general secretary, Father Victor Roche, says funds for projects in constituencies should go through a different channel.
"It should be properly asked for, budgeted for, planned.. and then they should have proper people who are ready to go to those projects and there should be proper companies - not ghost companies or maybe companies by the parliamentarians. The Catholic Church wants that there should be transparency."
Father Victor Roche.