Are you using a message definition? Do you see ModelObjectss in the 'External Name' column there? You can change that value.
Hello Mohan,
To me it looks like it applies an "s" wherever you're expecting an array.
Mendix recommends that all your entities are spelled in singular - and when retrieving a list the word "list" gets added to your variable name, I assume this is happening in line with that, except it adds an "s".