MIRO Error While Posting a Parked Document

Hi Gurus,

               I am having an error While posting a  document in t-code MIRO. Once the user Park's and Save the document as complete, I ahave developed a custom work flow to route it to the Approvers. Once the Workflow routing is compelted, the final Approver should be able to Post the Document. While Testing , When i try to Post a document ( Saved as Comeplete Before). I am having an error saying that, "Parked Document is Release relevant and cannot be Posted".  Is there a release strategy for MIRO ? Please guide me through this. Thanks!! in advance.

-Vishnu