Santosh,
Check that you have defined the user parameter "controlling area" both in the wetweaver gateway and in the sap backend.
Also check that you have defined this configuration in the backend system:
You have defined the company-code-dependent settings for the app. You do this in Customizing for Materials Management
under 
Logistics Invoice Verification
Apps for Logistics Invoice Verification
Approve Supplier Invoices
Define Settings Dependent on Company Codes
Best Regards,
Emanuel