PRC: Generate Cost Accounting events and PRC: Generate Revenue Accounting Events program are used to generate the accounting events in XLA for Costs and Revenue respectively. Costs and revenue have separate and distinct Auto accounting setup functions.As it seems, your cost related auto accounting functions were fine which was why the
PRC: Generate Cost Accounting events completed without error. Whereas PRC: Generate Revenue Accounting Events program showing the auto accounting rejection reason indicates an issue in you revenue related auto accounting functions.
Please refer to the Oracle Projects Implementation User Guide for more information on Auto accounting.