Vikash,
Please bear in mind that SCN is not the best forum for urgent messages. For such messages, you should consult local experts, or raise an OSS message directly with SAP. SCN is staffed by part-time volunteers. For us, prioritization of SCN messages is strictly a personal matter.
You have posted this message in an APO forum, and this message is unrelated to APO. It is an ERP message. You may want to just expand the message, and read the built-in Diagnosis texts, where it suggests that you check the production order settlement rules.
Best Regards,
DB49