I already have that namespace referenced but it still doesn't work

I am able to add invoices using the following which is working nicely. I now need to be able to return the custcol_newx_bookno, custcol_newx_pon and custcol_newx_deliverydate values when searching for all invoices for a particular customer. <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"…

i tried that but unfortunately it didn't work I get SearchColumnCustomField is an abstract type and cannot be instantiated I did find that adding bodyFieldsOnly to my searchPreferences and removing the columns i want does return everything along with all my custom fields, so i'm able to use that for the time being. That…