Payment release workflow

[Amit (Intelligroup)]

Hi All,
 
We are using sap standard workflow for document completion and posting via
workflow, when a document is posted by transaction MIRO it creates an IDOC
of document type RE and updates the financial books.
 
Now a payment release workflow in FI takes care of all the relevant
documents which are posted after an approval process, this workflow is
working well and fine with document type KR but its not getting triggered
for document type RE thus created as an IDOC from MM posting of invoices.
 
Any ideas what exactly are we missing in the same.
Thanks in advance
 
Regards
Amit