Sales Quotation update default values

Hi all,

Running AX 2012 R3 CU9, follow-up to: https://community.dynamics.com/ax/f/33/t/184615

I previously put code to default a sales order's custom text values in when the customer was changed. I did that in the modifiedField() method. I am currently trying to do the same to SalesQuotationTable, but modifiedField(), modifiedField_Project() and modifiedField_Sales() don't seem to be doing the job.

Is there somewhere else I should be putting it?

Thanks very much in advance,

Luke