Need clarifications regarding auto-complete rules for Payroll

Hi,

I built 3 separate Default Payroll ID autocomplete rules: 1) Hire, 2) Local and Global Transfer, and 3) Other transactions like Add assignment and Change assignment based on documents I found on various Oracle sites.

Payroll region is mandatory.

Hire and Local and Global Transfer work fine. Add assignment works fine too but I get an error for Change assignment.

I read another post here about the importance of instantiating variables because someone else apparently had the same problem, but I need clarification.

When I add a line to perform a check such as "If Get Payroll Assignment or Get Payroll Id IS NOT NULL" I get a "contact your help desk" type of error.