HR-CEE 110_604 installation on ECC 600 EhP4/Delta-Upgrade

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Symptom
You use transaction SAINT to install the add-on HR-CEE 110_604 on release SAP ERP Central Component ECC 600 EhP4 (referred to here as SAP ECC 600 EhP4).
Other terms
SAINT, add-on, installation, HR-CEE, 110_604, SAPK-604AGINHRCEE, CD51035418, EHPI, upgrade
Reason and Prerequisites
You use transaction SAINT to install add-on HR-CEE 110_604
OR
you are using HR-CEE 110_600 and want to upgrade [...]