Allocation default date to default to transaction date on previously form

Allocation form picks today's date when launched from posting a transaction. The allocation date should default to the date of the transaction posted on the previous form. At the very least it should show a visual reminder if the date is outside the accounting period of joining transactions. This request could link with another idea to make the allocation date amendable https://communities.sage.co.uk/ideas/i/how_would_you_improve_sage_200_/ability_to_amend_allocation_date