You can use transaction HRPAYDEBS to maintain or display the Construction Site Data table (T5DB4). The transaction can be found in the menu under Human resources -> Payroll Germany -> Subsequent activities per payroll period -> Payroll-related area -> Construction industry -> Construction sites.
If the user has maintenance authorization, transaction HRPAYDEBSP (Maintain Construction Sites) is called by the HRPAYDEBS transaction.
If the user is not authorized to use the maintenance transaction, transaction HRPAYDEBSA (Display Construction Sites) is called.
See: Authorization concept; Authorization object p_tcode.