MSS custom PCR - Guided procedure / roadmap

Hi,

I have created a custom PCR.:

1) configured QISRSCENARIO

2) created an interface in SFP

3) created a Adobe form in SFP

4) Implemented code in HRWPC_PCR BAdI for methods: INT_SERVICE_REQUEST_INIT, SCENARIO_SET_ADDITIONAL_VALUES, and SCENARIO_PROCESS_USER_COMMAND

I logon to MSS, select an employee and select my Scenario. The Adobe Form is displayed with the header data filled in INIT_SERVICE_REQUEST FM. When I edit the form and click on button "Review" the next page does not load 😔

Can someone please help me in resolving/troubleshooting this error.

thanks

Salim