This article discusses how to fix the following error,

when attempting to change the Price Entry to the option below and then clicking the OK button on the Goods Received Voucher Options screen, as seen below

Consider the following advice to resolve the above error:
In this case, the ‘Importation Split’ option is selected as you also need to capture additional costs by opening the Split Allocation button below,

As per the design of Evolution, the following is therefore forced when using the Importation Split feature:
Prices captured on:
can only be captured using the Price Exclusive Tax method.