05 July 2011
Suppose you leave the job in June, 2011 & want to transfer your PF account to your current account...anytime during July,11 to March,12... then you are required to submit Form 3A for (March,11 to June,2011) from your old employer.
Suppose, in the same above scenario, you decide to proceed the transfer process after April,2012....say June,2012, then you are not required to attach form 3A as the same must have been filed with the PF deptt till April,2012 alongwith their annual PF return for 2011-12.