Value "ZTOWEEK" is not a valid variable

Hello,

    we have developed a Planning Template in sandbox which worked well without any issues. It has value assignment for Variables i.e. Query Variables and Planning function variables. I started developing similar solution in Development, i'm getting invalid variable error. I couldn't figure out the reason for syntax error. I'm struck now, Can someone through me some light on this?

Little More details on Variables ( tried with Autoload of Datasource and Script Load Datasource):

1. Query Variable, Optional, input enabled. On variable initialization event... APPLICATION.setVariableValue is giving error message.

2. Planning Function Variable: Same error message.

Content assistant doesn't show any variables... but, i can see variable under promt settings.

Thanks alot for all your help!

Regards,

Ben.