You want to use rule Z123 to process only wage type 1200 in the results...

The rule Z123 is used to process only wage type 1200 in the results table (RT). The processing will differ for hourly and salary employees. To call the rule, you would use the format PRT Z123 1200 . Here, PRT is the command to process the rule, Z123 is the rule number, 1200 is the wage type to be processed, and  is left empty to allow for different processing for hourly and salary employees. References = 

https://theexamquestions.com/blog/sap-hcm-payroll-with-erp-demo-questions\