Invoice Date and closed period in EBS

What will happen if an Invoice with date belonging to already closed period in EBS is matched and posted to EBS:

1. Close previous month (Sep. 2015) in EBS

2. On 6.10.2015 create Invoice with invoice date 15.9.2015, and match it

3. Post it to EBS

Will the Invoice get posted to previous month, or the date will be to first open day of currently open period?

There are some discussions here talking about Regular and Permanent closure in EBS - if we don't want to post to closed period what should be the EBS setup?

My assumption is that users are expected to enter the Invoice date as it is, regardless of closed period in EBS, and when posted, EBS will make sure to post it to first day of open period.