First and foremost difference is that SAP ERP is a licensing model & SAP ECC is an installable unit. This means that you can âactually & literallyâ install ECC but not ERP. SAP Business Suite is a collection of many SAP applications and ERP is a collection of many installable units. Below will make it clear. 1  SAP Business Suite Applications = SAP ERP + SAP CRM +SAP SRM + SAP SCM + SAP PLM. 2  SAP ERP = SAP ECC + SAP XSS + SAP BW + SAP EP + SAP PI + SAP NetWeaver MDM + SAP NetWeaver AS.
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