Overview
For rental changes, this will find the pallet type rate on the day the charges are generated, then use this rate and charge this rate back to when the last invoice was created.
For example, if you do weekly invoicing. Have some stock at the start of the week on pallet type A, then halfway through the week, this is moved on pallet type B. When the charges are generated at the end of the week. This will charge this stock on pallet type B for the entire week.
This is just the way the system has been designed.
If you are changing any pallet types, it is recommended that this is done straight after an invoice has been created.
If you are looking at this retrospectively:
If this is a large amount, create the invoice, then credit them the difference.
If this is a lower amount, create an ad hoc sundry change and add this to the invoice.