Liquidity issues in the capital markets had affected a small number of Commonwealth Bank corporate and institutional customers but there was no evidence of wider problems, the bank said yesterday.Speaking at an analysts' briefing, CBA chief risk officer for premium business services Paul Riordan said there were no systemic or sector-specific issues in the credit portfolio.Riordan said: "There has been minimal change in our industry exposures. It is business as usual."Premium business services includes institutional, corporate and business banking, agribusiness, and a range of private client services including CommSec, private banking and margin lending.Riordan said 70 per cent of the group's exposures were investment grade. His risk management team has done some "deep dives" over the past few months, taking detailed looks at its agribusiness customers to measure the impact of drought and at pubs and clubs to see how smoking bans were affecting business.It has also done close analysis of the group's Queensland and New Zealand exposures, the commercial property market and the securitisation warehouse business. Some of the warehouse exposures have been placed on "stop origination" mode.Riordan said: "It is not a credit crunch, it is a liquidity issue. It has affected a small number of names and there has been some contagion."We can't ignore the interest rate rises at the back of that. There are going to be some pressure points there."CBA executive general manager institutional banking and markets, Ian Saines, said he was not rationing credit in the sense of favouring one sector over another but he was looking for clients that would provide the bank with good relationships. Saines said: "We have walked away from business where there was no ancillary service as part of the deal. We are looking to enhance relationships."He said this approach had resulted in higher cross-sell rates and a higher net interest margin."We have been market leaders in going for profitable growth. In institutional banking you are dealing with consenting adults who understand markets."Saines said institutional banking was enjoying a 30 per cent increase in lending. Syndicated lending activity doubled in the March quarter, compared to the previous quarter. He has hired a team in the US to take CBA clients to the US private placement market. Saines said he expected institutional lending growth to remain in the same range over the next 12 monthsExecutive general manager corporate financial services Robert De Luca said middle market clients were more cautious because of interest rate increases. He expects loan growth in the low teens over the next 12 months. Executive general manager local business banking Symon Brewis-Weston said he expected SME lending growth to be in the high teens over the coming year.