There are 4 JCo destinations to be maintained in portal.
The navigation path is as below:
Login Portal -> Content Administration
-> Web DynPro
-> Maintain JCo Destinations
SAP_R3_HumanResources
SAP_R3_HumanResources_MetaData
SAP_R3_SelfServiceGenerics
SAP_R3_SelfServiceGenerics_MetaData