Payroll Period Issue

Dear Gurus,

In Payrol Control Record

If i put Payroll Period 12 2009 01.03.2010 - 31.03.2010

& Earliest retro acctg period 12 2009 01.04.2009

Save then if i change Payroll Status Release Mode then

Payroll period 01 1976 01.01.1976 - 30.04.1976 is coming which is wrong.

Please Advised why is coming wrong

Regards

MHPO