Overall release of purchase requisitions

In our company, we're needing to change the purchase requisition release strategy from item release to overall release of PRs. We're planning to keep all existing characteristics as they are defined, just want to set the overall release indicator on the existing release group.

We're in ECC 5.0, release 640. Please let me know if there's any additional information that I can provide about our current R/3 enviroment.

There are two places that I have set the overall release indicator (OvRelPReq) using SPRO -

Define Document Types

Setup Procedures with Classification / Release Groups

Using SWECTYPV and I have activated the WS20000077 with BUS2105 at the RELEASESTEPCREATED event. I have activated the WS20000077 workflow template using PFTC.

When I create a PR, no release strategy is assigned.

Am I missing any critical step(s)? Any input would be great appreciated.

Thank you.