yeah that's correct,
But I mean, I haven't seen this before:
selDia.bindAggregation("items", "masterDataModel>/GlCodes?opco=FR01&language=FR", item);
=> ... calling the parameters directly in the path parameter with ? + &.
Somebody asked a question about filtering some days before, have you read it?
I think you have the same problem...
Also please read this Asking for coding help - SAPUI5 - (please read before posting coding questions)
And try to debug your code by yourself.