Accepting GL date of closed period while creating AP invoice ??

HI,

OCT-13 period is open.

Created and saved invoice header with GL date of Oct-13.

Then, Oct-13 Closed.

Nov-13 open

Created Distribution of the same invoice with accounting date of Nov-13 period.

Validated and accounted.

Why the invoice was allowed to validated eventhough  GL date at header level of the invoice was of  OCt-13 period which was closed at the time of validation ?

Is it intended functionality ??

Thanks