India's market regulator said on Thursday foreign investors would be allowed to buy rupee-denominated corporate debt on tap until they reach 95 percent of the 2.44 trillion rupees ($37.87 billion) allocated to them.Once that 95 percent limit is reached, however, custodians must halt any foreign investors orders, and the remainder would be sold off under an auction format, Securities and Exchange Board of India (SEBI) said in a statement.Further more, SEBI said that Indian corporate issuers would also be prevented from selling rupee-denominated debt abroad until the foreign ownership in corporate debt falls below 92 percent of the quota.