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is there a way on a pageinit function when a transaction is edited to set a custom field on the same line from another field value on that line?

You could use pageInit or beforeLoad in an UE

what am I doing incorrectly in my code?  I keep on getting a linecount value of null:  var recordId = context.newRecord.id;
            log.debug({details:"recordId  = " + recordId });
            var objRecord = record.load({
                type: record.Type.INVOICE,
                id: recordId
            });
     var lineCount = objRecord.getLineCount({
     sublistId: 'item'
     });