The People's Bank of China circulated in February 2017 a draft policy framework that forbids off balance sheet Wealth Management Products (WMPs) from investing in illiquid loans known as "non-standard" credit assets. Banning investment in non-standard assets would reduce non-bank lenders' willingness to lend, since the loans could not longer be easily packaged and sold. The rules also forbid WMPs from taking other WMPs as their underlying assets, a practice reminiscent of "synthetic" collateralised debt obligations popular in the US before the 2008 financial crisis. Synthetic products create risk of contagion, since the default on one product can create a chain reaction from linked products*).
*) the Economist August 5th, 2017