The Securities and Exchange Board of India has placed caps on the share of assets an actively managed debt fund can park in a single company's debt instruments. The move will mean that a mutual fund scheme would not invest more than 10% of its NAV in debt and money market securities rated 'AAA' issued by a single issuer. For 'AA', the exposure should not be more than 8% and for 'A' and below-rated companies, the exposure will be capped at 6%.