Access Financials uses the date to select the period, and will post into the closest one available based on the following:
The period must be open.
The user must have access to post to Restricted Periods if Working Periods are in use.
The user must have sufficient Future Period Posting rights if the date based period is ahead of the current open one.
Example 1: The Debtors ledger is in period 4, the working period is 6 and the invoice date relates to period 5
If the user can post to Restricted Periods then period 5 will be selected. If not then period 6
Example 2: The Debtors ledger is in period 4, the working period is 6 and the invoice date relates to period 9
If the user can post 3 or more periods ahead then period 9 will be selected, if not then the period nearest period to 9 will be used.
As well as the above, there are other possibilities to explain a date/period mismatch:
The period can be changed manually at the point of posting and doing so will not affect the date - changing the date will affect the period based on the user's permissions.
Changes made via the Corrections tool to the date will not affect the period unless that too is changed - and vice versa for period changes.
Reversing journals use the original posting date for their reversal - So a reversing journal posted 31 May will reverse in the next period with the same date.