Greece issued a legislative act on Monday requiring public sector entities to transfer idle cash reserves to the country's central bank, as part of efforts to deal with a cash squeeze. Greece has been tapping into the cash reserves of pension funds and public sector entities through repo transactions as it scrambles to cover its funding needs. Cash reserves that are needed by these bodies for their immediate payment needs are also excluded from the regulation. Athens' scramble for basic funds shows how extreme the financial constraints on Greek Prime Minister Alexis Tsipras have become as he tries to convince sceptical foreign creditors to extend his country new financial aid.