RUC Validation. For purposes of control, in Peru, public and private enterprises are identified by a Taxpayer Registration Number-RUC. For this reason it is of much value to accounting or financial applications are more secure and reliable to record these numbers.-RUC Validation.　For purposes of control, in Peru, public and private enterprises are identified by a Taxpayer Registration Number-RUC. For this reason it is of much value to accounting or financial applications are more secure and reliable to record these numbers.