Where should I implement cross-validation rules?

Cross-validation rules are used to validate payroll cost account combinations during the costing process.

Implement cross-validation rules in payroll before the first payroll run is processed to be sure the cross-validation rules are applied as expected and to avoid the creation of invalid cost code combinations. If you're implementing Financials or planning to implement in Financials in future, implement the cross validation rules in payroll that you're planning to implement in financials so that invalid cost combinations aren't sent to Subledger Application (SLA) or General Ledger (GL). Once you implement Financials, you can copy the same rules in GL accounting cross-validation rules. If you have a third-party financials system with account combination validations, you can create those validations in Payroll using cross-validation rules.