You are able to contra off the original entries (credit note/negative receipts etc) and allocate these contra
entries off at the same year period and then re-enter and then allocate at the correct year/period you wanted.
Note: If you have the Corrections module you can delete the transactions and re-enter and then you will be able to allocate at the required year/period.
Support can review to determine whether it can be amended or not but depending on how many transactions involved, there is no guarantee we can resolve this.
To investigate further Support will need to run some scripts on the database. Therefore please raise a new case online and reference the title of this article and please provide as much detail as possible, including customer code, audit numbers involved, if not provided could delay the progress with your query.