Hi Manohar,
I guess the Message is inactive because it is not assigned to the current Activity in the Activity Sequence.
From your screen-shots, I can see that your Data Proposal is for Legal Regulation 'CSGB', but your Export Declaration is for Legal Regulation 'CUSGB'. That discrepancy is causing the problem. I can't think why you have created 'CSGB' - the standard is 'CUSGB' and that should be perfectly sufficient.
Hope that helps.
Regards,
Dave