3621661 - Cannot assign custom roles to users in ECP due to error "Assign role Z_SAP_XXXX is not allowed in ECP"

Error when assigning custom roles to users in SU01: "Assign role  Z_SAP_XXXX is not allowed in ECP."

Payroll Integration EC to Employee Central Payroll

error, assigning role, SU01, Z_SAP_CLOUD_EMPL_ESS_PAYSLIP, ECP, customer roles, Z_CUST, SAP SuccessFactors Employee Central Payroll , KBA , LOD-EC-ECP-PY , Payroll Integration EC to Employee Central Payroll , PA-BC , Authorization and HCM Basis , Problem