problem with pgi

hi Guys,

Can any one help me solving this problem.

Period 009/2007 is not open for account type S and G/L 894025

Message no. F5286

Diagnosis

Period 009 of fiscal year 2007 does not exist in table T001B either in period 1 or in period 2 of a table entry with record type "0", the selected company code, the account type S and the G/L account 894025. The period is therefore not open.

Thanks