Account type M and G/L account with open item management not permitted

Hi,

I am getting the following error while applying VL02N (PGI) is "Account type M and G/L account with open item management not permitted". Before I got an error like posting period and I have closed those posting periods 2008/08 and 2008/07. Now I am getting this error.

Please provide the solutions to overcome this and I want to execute the full transaction.

Thanks in ADVANCE.

Kishore