Link Missing between MIGO, Miro Document and Accounting Document

Hi

MIGO and MIRO documents were generated before 3 days and the accounting document were also generated.

But today when I view the MIGO and MIRO document clicking the Follow on document to find the accounting document. System issues a message " No FI document generated".

However the FI document is generated. The link is losed.

Kindly clarify

REgards

V.Krishnan