A parked invoice does not get subject to release

Hi,

I am trying to test workflow for parked invoice. I have defined release criteria, and parked an invoice (complete for posting). I have ensured the values as per release criteria, viz.,

1. Invoice is processed for the same company code as in release criteria.

2. Release group is assigned to the vendor master in that company code.

3. D/C indicator is set as S Debit.

4. Invoice amount is greater than the amount specified in release criteria.

5. My own id is assigned as release agent.

But the workflow is not getting triggered. As I understand from another post on SCN, workflow will be triggered if the parked document is complete for posting (RBKP-RBSTAT='B') and is subject to release (RBKP-RFGKZ='X'). In my case RBKP-RBSTAT='B', but RBKP-RFGKZ is blank.

Any suggestions as to why the invoice is not getting subject to release? Request your help.

Thanks and regards.

Satish Patankar.