Thank you for your reply.
Yes once the custom value is entered then you have to skip error checking in order to build the code.
The real issue is that the CodeWarrior tool has a fault in that it provides the RCW bits 212-211 binary setting as 0b01 for selecting the System Clock as the DDR_REFCLK_SEL. The correct binary setting is 0b10 and hence a custom value needs to be entered in the tool settings.
