Is using an alternate PARENT_PACKAGE currently supported?

[darach]

Hi folk,

Perhaps this is user error, but using an alternate PARENT_PACKAGE in the codec
generation results in failing acceptance tests after mopping up any obvious import
issues:

@@ -190,6 +194,9 @@ project(':fix-44-codecs') {
         main = 'uk.co.real_logic.artio.dictionary.CodecGenerationTool'
         classpath = sourceSets.main.runtimeClasspath
         args generatedDir, '../../quickfixj/quickfixj-messages/quickfixj-messages-fix44/src/main/resources/FIX44.xml'
+        systemProperties = [
+            PARENT_PACKAGE: "foo.bar"
+        ]

         outputs.dir generatedDir
     }

It seems logical to use different parent packages for different FIX dialects but it looks like a uk.co.real_logic.artio parent package is assumed at least at the moment, or is it a missing
configuration step, for example, or do some artio packages like Session need to be tweaked
to use different Header Encoders etc..?

Cheers,

Darach.