Problem with 3PR Eval Run in Payroll Off-Cycle process model

Utilizing the off cycle process model, we are trying to change from using the 2 steps for Garnishments which include the program RPCALCU0 using schema U500 and then running the 3^rd party Evaluation using program RPURMU00.  We are trying to replace those 2 steps with 1 step which involves running program RPURME00.  The 3rd party process appears to run successfully and completes with the desired output, but the HR Process Workbench is indicating an error on that step.  The counts show 1 initial and 1 overall.  Everything else is zero.   We currently have have RPURME00 running after RPCIPP00 in the model.  Can anyone tell me why this might happen?

Thanks

Tim