Variance not getting calculated for right period

Hello

I am facing a little issue during period end closing of July. Due to some reasons, production data was not entered timely which cost us backlog. This back log was cleared in August. But during period end closing, the system started showing unusual behaviour.

July's production orders were created in August while clearing the backlog. All confirmations and GRs were done in August (with posting date in July).

July's completed production orders were marked TECO (but in August).

Now during period close, the system is not calculating variance for July for completed orders, instead of calculating variance in August for those orders completed in July (probably due to marking TECO in August in backlog clearing).

What should I do now, Is there any workaround to this?

Your help will be highly appreciated.

Thanks & Regards,

Abdullah